In 1 Love 9, protagonist Takuma moves to Tokyo to attend high school, only to find himself being courted by his female classmates due to there being one male student to every nine females in his school.
Abnormal Kei Joshi features an unwanted harem in which the word "unwanted" is strongly emphasized.
Very much unwanted in the Not Safe for Work manga Adamasu no Majotachi - the hero has a condition known as Adamas Syndrome, which allows him to ejaculate rose diamonds worth 5 million yen, but he loses a year of his life every time he ejaculates, and the women just want his semen in order to get rich.
Ah! My Goddess is arguably the Trope Maker, since it predates all other examples by many years (1988). Keiichi Morisato somewhat, since not all of the seven Goddesses that have been shown are in love with Keiichi; it does fill the unwanted part with all of them except Belldandy. It's rather poignant, since basically anyone can barge into the temple at any point in time and abuse their welcome.
In Ai Yori Aoshi, Kaoru has Aoi, Tina, Taeko, Mayu and Chika in love with him. Out of all of them, the only one he wants is Aoi, but circumstances prevent him from letting anyone else know that he and Aoi are the Official Couple.
In Akarui Kazoku Keikaku, Honoka naturally draws an assortment of guys who instinctively want to protect her and maybe become her boyfriend, including the guys she has to live with (a pair of twins in kindergarten, a junior high student, a high school student, a college student) and the guys she meets in school.
In Ane Kurabe, Shun finds himself being pursued by his four childhood friends - Rio the athlete, Miku the cook, Nana the nerd, and Yuri the student president.
In Asa kara Pika Pika, Itou Maasa finds herself gaining the attention of three brothers, all named Hiroshi.
In Black Clover, Asta gains the interest of his teammate Noelle, her cousin Mimosa, and the girl he met on a group date Rebecca. And possibly foreign assassin Mariella and ancient wizard Secre, previously known as Nero. There's also Sally, a Mad Scientist of the villainous Eye of the Midnight Sun organization who's shown to have great interest in Asta wanting to perform "experiments" on his peculiar body. Overall, Asta is blissfully unaware of this and is devoted to winning the heart of Sister Lily, the nun who works at the orphanage where he was raised — who isn't interested in him.
An unusual case is Leicester Maycraft of Blessing of the Campanella, who doesn't seem to be too bothered by the attention from the main girls around him, including his mom Shelly. He seems to just laugh it off even when it happens in public.
In Brave10, Saizo starts building one up with Clingy Jealous Girl Isanami and Crazy Jealous Guy Kamanosuke fighting over him. Throw in a way hands-y formerarch-enemy and a few other unwelcome propositions, and he gets seriously unwanted yandere harem.
In Bonjour Koiaji Patisserie, protagonist Haruno transfers into a cake-making academy, and becomes the target of affection of the four most handsome boys in the school.
In Boy's Abyss, Reiji Kurose has pop idol Nagi Aoe, teacher Yuri Shibasawa, his childhood friend Sakuko "Chako" Akiyama after a Despiar Event Horizon and his other(ex-)childhood friend and Loving Bully Gen Minegishi pining for him. His mother Yuko Kurose is a nonsexual (thought still uncomfortably so) variant where she grooms him to be a passive and obedient son. Once he starts desiring a life of his own, he gets increasingly more anxious about the attention he's been attracting, especially since at least three of those aforementioned characters are straight-up Yanderes.
In Butsuri-san de Musou shitetara Motemote ni Narimashita, the hero is forced to learn magic, and discovers that he can make any girl fall in love with him, gaining a harem of Cute Monster Girls.
Horribly subverted in the second season of Case Closed. A Rich Bitch named Reika Yotsui seems to have four young men (Nikaido, Mifune, Ichieda and Gojou) and an older man as her all-male harem... but one of them, Ichieda, actually liked the granddaughter of the family's Old Retainer, Yaeko. Whom Reika and Nikaido killed years ago. And so, Ichieda poses as a member of the "harem"... and then he kills Reika and Nikaido.
Cheeky Angel has another female main character with a male harem although there are some gender issues.
One City Hunter story arc has a female-central version. Kimiko, the seventeen-year-old Girl of the Week in said story arc, finds herself surrounded by many men who wish to marry her despite her clear lack of interest in marriage at this point in her life (that, and the fact that all of the pursuing men are strangers). Her grandfather hires Ryo to help her keep the pursuers off her back, while Ryo considers finding out the reason behind such a sudden surge of pursuers imperative to fulfilling his job.
Played for laughs in D-Frag!. Kenji Kazama is a self-appointed delinquent who would prefer to hang out with his (three-person) gang, but he is continually being forced into uncomfortable and often painful situations by the both of the school's otherwise all-girl Game Development Clubs, both the original and one that split off, which he is a part of (minus Yamada and Sakuragaoka in the original club, but the latter severely suffers from Dude Looks Like a Lady syndrome). This normally results in large amounts of pain or embarrassment towards him.
In Da Capo, almost every main girl is somewhat romantically related to Junichi.
Initially present in Date A Live. Shido is forced into dating the Spirits lest his embarrassing past be made public. This is similar to The World God Only Knows in that there's an ulterior motive - the Spirits are incredibly powerful and cause destruction even without intending it, and Shido is inexplicably able to seal their powers by making them fall in love with him. He becomes more willing after learning about this.
Mamoru Onodera from Deadline Summoner presumably did not get much say in whether or not his summons joined the party. Particularly poignant in that summons are not supposed to act independently of their masters.
In Final Approach Loosely, Emiho, Miki, Shizuka and Akane are romantically involved with Ryo in varying degrees.
In Fractale, Phryne, Nessa, and Enri all seem to have some sort of feeling for Clain, but he only has feelings for Phryne.
Fujimura-kun from Fujimura-kun Mates, consisting of a Cloudcuckoolander, a School Idol, and the Student Council President. Three adorable girls who are all deeply in love with him. And they are willing to share, too! It is a merciless parody however, as Fujimura is in no way happy with the attention he gets at all, and all of the girls are more or less complete morons with Fujimura being the Only Sane Man.
Gintama eventually turns into this. Some fans speculate that Gintoki's lack of interest in anyone could mean he's asexual, especially after recanting his crush on the weather girl & claiming he was just a fan. This is Played for Laughs in one storyline where the female characters (including old lady Otose) and... MADAO convince Gin that he had a one-night stand with them (on the same night) and now has to take responsibility. It's a ploy to get him to stop drinking so much.
Girls Bravo: Four girls have feelings for Yukinari, one is a bully who has beaten him up almost every day for years, another is an insane YandereDark Magical Girl who tries to abduct and rape him, the third one is a kind and sweet girl who does not set off his woman allergy, the fourth one is the Big Bad another YandereDark Magical Girl.
Girls Saurus thoroughly establishes the "unwanted" part, as the male protagonist Shingo suffers from extreme gynophobia after being violated and brutalised by a gonkish admirer. This does nothing to deter a very determined main cast of girls (including his own sister!) as well as several minor hopefuls. At one point he states how their shriveled hag of a teacher is his "ideal woman" (no threatening sex appeal) which causes her to have a womanly awakening overnight, become hot and young-looking, and try to woo him very directly. He does not approve.
In Hachi Ichi, Shinichirou's grandfather deems his current life-style unfit for a heir, so he throws him into a house with eight young and beautiful girls and tells him that within one year he'll have to choose one of them as his bride.
Hachigatsu Kokonoka Boku Wa Kimi Ni Kuwareru It's pretty safe to say that Sakurai wished he was a nobody rather than deal with all of these monster women stalking him. Whenever a female monster has him in their grasp they debate whether to rape, eat, or kill him. Sometimes in that order.
Kyoko has her fanclub, Jiro, and Kujou Sukenoshin.
Subverted in Hana no Ko Lunlun's Netherlands arc. Lunlun befriends three handsome brothers... but the three fall for her after a "pep talk" from Togenishia and propose to her at the same time. Lunlun runs away as soon as she can to continue her mission, much to the three's dismay, and a lesson about shallowness is delivered by Serge.
Also alluded to and tweaked in a story that's mentioned in said episode. A princess had three suitors, each one giving her a precious gift: a crown, a sword, and a jewel. She doesn't like any of them so she takes a third option via using magic to transform herself into the first tulip flower: the three petals symbolize the crown, the sharp leaves take after the sword, and the bulb looks like the jewel.
Hanaukyō Maid Team. Hanaukyo Taro inherited his grandfather's fortune and, with that, hundreds of maids willing to serve him. In each season he has three personal maids who constantly try to seduce him. The problem: he's only a child.
Happy Lesson has a school full of Hot Teachers who all decide to play mom for the socially-withdrawn Chitose, who doesn't really grow to appreciate this suddenly forced invasion of personal space until well into the series, and even then he still blows his top when he thinks they go too far.
Both main characters in His Favorite experience this. Yoshida, while being the unattractive Beady-Eyed Loser he is in-universe, has three people with unrequited crushes on him (Chronic Hero Syndrome Nishida, NarcissisticWholesome Crossdresser Murakami and Dominatrix Tsuyako). Saito tops him with nearly the entire female student population in his school and girls from many other nearby schools due to his irresistible looks. The "unwanted" part comes into play when the two are already in a relationship with each other since the beginning and both their respective admirers won't back down when they found out, especially since Saito is only interested in Yoshida and no one else.
Hozuki-san Chi no Aneki There's one developing around Gorou with Misaki, Mizuno, and Kyou - it's unwanted because he's too smitten with his stepsister Haru to consider any of them as a love interest.
Irresponsible Captain Tylor. AVERTED and wrapped up in a single episode where Tylor manages to blow off confessions of his harem. Whether this was on purpose or just bad timing is up to interpretations, like everything about Tylor.
Shinichiro in Isuca has one, although he's not even the main character — that role belongs to his only serious love interest, Sakuya. But every other female character at least constantly teases him, and some take deeper interest, most notably Suseri.
JoJo's Bizarre Adventure: Stardust Crusaders: Jotaro Kujo brushes off women fawning over him as a pain in the ass, anytime women start arguing he immediately yells at them to shut up, honestly... any time women even make a noise that would qualify as fawning would cause Jotaro to start losing his cool. In his own words "It pisses me off when women scream." however he loses this trope in later parts and becomes more patient with women.
Parodied in the Kaguya-sama: Love Is War bonus chapter "Kagukoku: Miyuki and His Girls" where Shirogane awakens to find himself in a Heisei-era harem series with the girls he knows (only one of whom is actually in love with him in canon) turned into a stereotypical harem. Kei is the brocon step-sister who lives alone with him while their parents are overseas, Fujiwara is the clingy childhood friend who made him promise to marry her when they were kids, Kaguya is the haughty Ice Queen who falls for him the moment he makes a comment about her behavior, Hayasaka is the perverted maid, and Iino is the kohai who has a crush on him for no reason whatsoever. The whole thing turns out to have been a dream that Ishigami was having.
Little House with an Orange Roof: Subverted. Shoutarou definitely gets attention from a lot of women, but, being older than most manga protagonists, he is mature, confident and stable enough in his affections to firmly but politely decline the admirers he is not interested in.
Kurogane Pukapuka Tai is a Yuri version of this, in which Oblivious To Lesbianism Commander Kuki is the center of a harem of women after her: violently protective but shy XO Mamiya, (mostly) Chivalrous Pervert U-Boat captain Nina, and aggressively womanizing Royal Navy Captain Ann. Much violence (but little blood) ensues, naturally.
Next to Tenchi Muyo!, Love Hina is one of the most well known examples. By a third of the way through the series, Keitaro literally has beautiful girls throwing themselves at him (Shinobu, Mutsumi, and Motoko). Problem is he's already made up his mind, Naru.
Magikano - Haruo has Aymumi, Yuri, his sister Maika and Marin (although in her case, it's unclear if she DOES have deeper feelings for him).
In Majikoi! Love Me Seriously!, Yamato confesses his feelings to Momoyo, but she rejects him, wanting to remain friends. The other four girls then decide they want a shot at taking him.
Martian Successor Nadesico could be described as the wacky, bipolar love child of Tenchi Muyo! and Mobile Suit Gundam. There's a lot of women on that ship, and much to the chagrin of the male crew, almost all of them (or at least the one's with screen time and names) insist on fighting over the Unlucky Everydude who has enough problems of his own. Lampshaded in one scene where one of them points out it's a popular anime trope.
The h-mangaMating with Oni, begins with a young man named Soichiro, who moved back to his grandparents hometown after leaving the city, going over to the house of Momiji, a red-oni to play. When Kaede, another red-oni and Momiji's mother, returns home she finds Soichiro asking Momiji to untie him and play another game, and Kade thinks that Momiji lured Soichiro into their house to kill him and eat him, but Momiji says she likes Soichiro and when Soichiro says he also likes her, Kaede says she's happy to hear that because oni tradition states that if an oni falls in love with a human, then that human will be abducted and forced into marriage. Soichiro at first tried to resist, but eventually accepts his situation and gets married to Momiji, and even takes Kaede as a wife as a well. When he's kidnapped by Ruri and Hari, members of the rival blue-oni clan, they intend to make him their husband, but he tells them he's not iterested because he's already married and tries to walk out of their house and go home, but he's hypnotized and falls in love with them. When Momiji and Kaede rescue him they un-do the blue-onis' brainwashing, and Momiji later becomes pregnant with Soichiro's baby. When Soichiro takes Kaede and Momiji to the city to tidy up the condominium his late parents left him he intends to take care of business as soon as possible and go back to his baby daughter, whom was left with his grandparents, but they're surprised by Ruri and Hari who broke into the condo. After a pasionate night, the two pairs of women reach an agreement and Soichiro ends up with a harem four oni women.
Mobile Suit Gundam Seed Destiny introduces one for Athrun Zala, as Lunamaria "Luna" Hawke, her younger sister Meyrin, and his ex girlfriend Lacus's Body Double Meer all compete for his attention. Athrun, for his part, is still in love with Cagalli, and even ignoring that, is too focused on the war effort andon his deep issues to pay much attention to romance, so he generally just ignores it all (with the exception of Meer, who is the most outspoken one since she's been led to think he's still engaged to Lacus, and while Athrun cares for her as a person and shows worry for her actually quite difficult life, he'd rather not have her chasing him). The series ends on an inconclusive note: Athrun and Cagalli still care for each other greatly but their romantic relationship is in tatters, and may be irrecoverable, and not to mention Cagalli herself has finally become an Politically-Active Princess so she priorises her political work. Luna has hooked up with her best friend and teammate Shinn instead, while Meer pulled an Heroic Sacrifice for Lacus in front of a shocked and tearful Athrun. Meyrin is shown accompanying him at the end, but the nature of their relationship could go in either the romantic or Just Friends way.
The sequel Mobile Suit Gundam SEED Freedom clarifies this mess: Athrun's love interest is still Cagalli. And it is still mutual, both of them are shown to be wearing their respective gifts given to each other in the preceding series: Athrun is wearing Cagalli's Haumea amulet given to him in SEED and Cagalli is wearing Athrun's ring given to her in Destiny again (after removing it at the end of Destiny) as a necklace.
Yuuki Momozono, the protagonist from Momogumi Plus Senki started to gain this position as soon as he come into the story. To specify: Yukishiro, Sawa and Masahiko, the three devoted followers, each have their own moments that is much more than that master-follower relationship, Koh is rather too friendly around him, Uraha is Tsundere around him, Saolan expresses interest in him, Kikyo clearly likes him as his "Rurika", Cinderella (clearly an expy of Belarus from Hetalia: Axis Powers) also wanted him to be her prince before settling on being friends with him and finally Tokiha was his previous incarnation's love interest, and spent all her lives to find the Momotaro that is his reincarnation who knew of her "True Name" (Which Yuuki happened to be).
Monster Musume has the main character suffering through this with different monster girls. So far, there's a Lamia,Centaur,Harpy,a Slime girl,a Mermaid,an Arachne and a Dullahan. Somewhat unusually for the genre, the main character is well aware of their affections for him and actually returns some of their feelings, he just doesn't want to choose any one of them because it'll mean breaking the hearts of the rest. Plus, he actually has the Japanese government pressuring him to marry one of them.
Nagasarete Airantou. Not only is it an Unwanted Harem, it's also on a deserted island filled with women and talking animals. The women are determined to have the Ikuto, the only male, to themselves, to an often violent degree.
Sasuke from Naruto. Just about every girl back at the Ninja Academy, Ino and Sakura included, practically drooled all over him whenever he was around. Tenten and Temari also comment on him being cute at some point. Later and judging by Karin's and Mei's reactions to him, this trend has continued.
Nectar of Dharani: Kai gets a princess of a fallen kingdom, a pureblood werecat, an army captain, an alchemist, and a princess of a prospering kingdom all lusting after him. Kai is well aware that the situation makes his life much more complicated... but can't help but privately admit that it has its perks.
Negima! Magister Negi Magi plays it straight... for about 2 volumes, then Subverts it, Averts it, Lampshades it, and turns it upside down before playing it straight AGAIN. Maybe. Would you like a side of trope with that? It's unusual mainly because the male lead is 10 years old, and all the girls (who are also his students) are well above his age (although still too young), so the romance is mostly played for laughs. The ones who do have serious romantic moments are Nodoka, Yue, Ako (in love with his aged-up alter-ego), Makie, Chachamaru (a robot), Ku Fei, Ayaka, Akira, Chisame, and Asuna (maybe). Later he also has to deal with Anya, Shiori, and Fate. And these are just the ones who can be described as having a serious crush. For the non-serious: Konoka mentioned that Negi would be attractive when he got older in an early volume, Setsuna had a pretty shipteasy moment that Chamo noted sounded 'like a love confession' during the Tournament Arc (though it turned into a Kono Setsu moment pretty quickly), and Misa proposed the Reverse Hikaru Genji plan, noting that if they waited five years it would be much more normal for the girls to go out with him and later also got a crush on his older counterpart. Overall, that's 11 or 12 that have a definite interest in him, and 3 more that have expressed at least a small attraction.
Ninja Nonsense parodies this in episode 11 when Sasuke takes over the show. He promptly makes all the female cast members (including Kaede's mom) fall in love with him.
Nisekoi - Raku has Chitoge, Kosaki, Seishirou, and Marika. The problem is, he made a Childhood Marriage Promise to Chitoge, Marika and Kosaki, and to make matters more complicated, he must at least pretend to be dating Chitoge or his yakuza and her gangster family will start a war, Seishirou is an assassin sent to kill him if he ever stops going out with Chitoge, and he can't dump Marika because her family controls the police and his family is a yakuza one. And that's just the first season. Chapter 58 introduces Seishirou's rival, Paula McCoy, and who knows what that one is thinking. When she was first introduced, she tried to challenge Seishirou to a duel, and when she proceeded to ignore her, challenged her to a contest to see which of them could kiss Raku first- by force if need be, and gunfire is allowed to be used to prevent the other from winning. The next time we see her, she's sitting in class next to Kosaki's sister Haru, and she brought her hand grenades with her. And then, Haru and Yui Kanakura (Raku's childhood friend and the main cast's new homeroom teacher) also end up included in the harem.
Nyan Koi! is all about Junpei Kosaka doing favors for cats. That doesn't mean his harem is non existent. Kaede Mizuno, Kanako Sumiyoshi, Nagi Ichinose (probably), Akari Kirishima, Kotone Kirishima, and if you want to add her Chizuru Mochizuki all love cats, and putting two and two together, you get one harem based on cats. Of course, the cats take more of a priority over his harem.
In Omamori Himari, Amakawa Yuuto has an Unwanted Harem comprising two Unlucky Childhood Friends and at least twice that number of Cute Monster Girls. Yuuto cares about Himari the most. Not that it stops the others, especially Rinko and Kuesu, from trying to hook up with him. At the end, while no one officially got married, Yuuto is now living with a dozen girls, half of whom had sex with him, and he seems to be going along with this.
Exaggerated after Luffy does the gorgon sisters one of the biggest favours they could ever ask for, he ends up with an entire ISLAND of Amazons immediately taking a liking to him, though Luffy himself treats the inhabitants of Amazon Lily (including their queen, the World's Most Beautiful Woman) as friends at most.
Señor Pink is surrounded by a bevy of beautiful, scantily clad women who swoon every time he does something "hard-boiled". He constantly states he only does these things because he likes them while insulting the women and telling them to get lost, which just makes them swoon harder. He is entirely genuine in his disdain for the women as he's remained loyal to his deceased wife.
The Reverie arc makes it quite clear that Luffy unknowingly created a royalty harem for himself that consists of Princess Vivi of Alabasta, Princess Shirahoshi of Fishman Island, and Princess Rebecca of Dressrosa. All three of which met each other during this arc, and were able to easily get along due to having one notable thing in common; being saved by Luffy and his Straw Hat crew. Add in the Snake Princess, Boa Hancock, having fallen madly in love with him, and that's a total of four girls of royalty showing interest towards Luffy.
This trope is played straight with Sanji, who really does have the inhabitants of an entire island wanting to get in his pants. The problem is said inhabitants are all okamas, so he spent the entire time on that island literally running away from his admirers.
Tomoya in Oneechan ga Kita has at least two girls interested in him. His Not Blood Siblings step-sister Ichika, and his classmate Fujisaki. A couple of the other female characters, while not actively chasing after him, have also expressed some interest in him as well. And while he likes Fujisaki, his sister is a Clingy Jealous Girl who won't let the former have her way with him.
Ouran High School Host Club plays this both plays this straight and inverts it. The harem involving Haruhi and the other hosts is played completely straight, and the individual harems of all the boys are inverted. It's what keeps them in business.
Peter from Peter Grill and the Philosopher's Time has an increasing number of Cute Monster Girls after him. Unfortunately, in this case the harem really is unwanted; the only girl Peter really wants to be with is his longtime sweetheart Luvelia, but she's incredibly ignorant about sex and thus he can't consummate his relationship with her. The other girls are mainly after Peter so he can give them strong children, and they constantly blackmail him and churn his libido to get him to have sex with them.
Puri Puri. It's unwanted because protagonist Masato wants to enter the priesthood, and priests are supposed to be chaste - if only he wasn't in a all-female divinity school...
It's the Trope Namer, but it's an Unbuilt Trope due to predating modern harem anime and more fitting a Love Dodecahedron; Ranma's status as a Chick Magnet is generally not much more than an annoyance to him. Though he's not enough of a cad to abuse the situation, it soothes his manlyPride — badly battered by his Attractive Bent-Gender curse. And though all the girls involved adore him, they're also rather exasperated by his wishy-washy attitude. It should be no surprise that the end-of-series attempted marriage ended in a Blast Out.
Subverted during the Reversal Jewel arc when Shampoo, under the jewel's effect, attempts to leave the harem, Ranma rather insistently runs after her to get it back, at first because of her abrupt change of temperament than due to his ego rather than true feelings. Lampshaded by Cologne when she notes that he got so used to Shampoo chasing him, he had to find out why she stopped.
In Episode 4 of Season 2, it's indicated (by way of Flash Back) there are at least two girls whose fathers Genma promised Ranma to long before he is even introduced to the rest of the cast. Ranma Lampshades this by asking 'How many more fiances do I have, anyway?' at the end of the episode.
Akane Tendo herself has an unwanted harem; it started with Handsome Lech Tatewaki Kuno, who issued a statement he would allow no boy at Furinkan High to date Akane unless they could beat her in a fight, leading to a mob of them attacking her upon her arrival to school each day. After her Arranged Marriage to Ranma, who then kicked Kuno's ass, these nameless schlubs gave up on her — but Kuno didn't. Finally, Ranma's rival Ryoga Hibiki is desperately in love with Aakne, but too shy to express those feelings to the clueless Akane. So he settles for keeping his status as having been cursed by Jusenkyo to turn into a miniature black pig a secret from her, resulting in her adopting this form as her pet "P-chan".
Maison Ikkoku: Has one centered around Godai. Kozue and Ibuki definitely want to jump his bones and even Akemi has hinted at an interest (although with her it can be hard to tell if she is serious). The only one he actually wants is Kyoko.
Urusei Yatsura: Normally, Ataru Moroboshi is a Harem Seeker who repulses all the girls he chases and the one girl who does love him, Lum, is a Clingy Jealous Girl that he doesn't want to admit to caring for (and initially didn't want at all, their engagement being an Accidental Marriage). But in one episode exclusive to the 1981 anime, Lum is accidentally cloned by her friend Ran, creating a swarm of dozens of Lums, all of whom want to be with Ataru. The idea of having a literal harem of Lums absolutely terrifies Ataru, who desperately tries to reverse the process and change them all back into one Lum.
Rappi Rangai. Raizou. No matter how many times he leaves the smitten princesses in the dust.
In Reborn! (2004), way back in the beginning of the series, remember all the fangirls in the school dying to give Gokudera and Yamamoto chocolates? Gokudera, of course, considered it an example of this, and told them to "Stop following [him] around!" The series itself has been often interpreted as "The Adventures of a badass Uke mafia-boss-in-training and his Unwanted Harem of Bishōnen!"
Tsukune of Rosario + Vampire (pictured on the main page) accidentally enrolls in a monster school and acquires — mostly through conquest — a vampire, a succubus, twowitches, and a snow woman.Marrying them all is ruled right out, due to the harem's tendency to spontaneously break out into superpowered free-for-alls both over and against him during bouts of jealousy, though the loli witch does repeatedly ask for a threesome with the vampire. Even harem aside, their unique... quirks... would make a relationship with any rather hazardous (though Ruby is a pretty safe option, if you use a whip like Tsukune). Don't forget when a guy comes in to recruit Tsukune for the monster mafia. He suggests he can just bring all the girls with him, using polygamy to solve the problem. The Official Couple disagrees...but everyone else thinks its a great idea. Then the vampire half of the Official Coupledisagrees again, by knocking everyone else unconcious. Notable in that Tsukune's already clearly picked his favorite, which the others notice.
Some later issues deconstruct the trope by showing emotional effects on the girls who know they have already lost out to Moka but are still hopelessly in love with Tsukune, in more realistic, non-comedic, non-I Want My Beloved to Be Happy ways rather than a typical use of the trope. Kurumu in particular has had a few heartbreaking scenes of unrequited love and it's been all but stated that, being a succubus, not being loved back can potentially have fatalconsequences for her. To make things more complicated, initially Tsukune is in love with one of the heroine's split personalities — the other one just kind of scares him. Even worse, the girl he loves isn't even real, but an artificial persona based on the heroine's mother created by her rosary to protect the "real" girl. Tsukune later confesses to loving both Mokas, each in their own way, possibly due to the prolonged amount of time he spent with the "Inner" Moka in the second season. And "Outer" Moka approves of this (reluctantly in the anime), encouraging "Inner" Moka to accept her feelings for Tsukune. In the end, the "Outer" Moka seemingly dies, but the epilogue reveals that she was actually absorbed into "Inner" Moka who gradually started to show some of "Outer's" traits...which is less obvious than might be expected since it overlapped with "Inner's" own defrosting.
In Sayonara Football, all of Nozomi's childhood friends have a crush on her, although she is unaware of this.
Sayonara, Zetsubou-Sensei has this with how the girls randomly fall in love with the teacher Itoshiki, when he promises to "take them with him" when he commits suicide. Unfortunately for Sensei, most of the characters fall square in the Yandere type...
It can be played straighter in the original Visual Novel, however the player must "play" his/her cards VERY well for that to happen.
Seitokai Yakuindomo - Takatoshi is just attending the only-just-recently co-ed school because it's closest to his home, yet the girls are convinced he's there to get a harem. And he does: It's confirmed that Mitsuba, Shino, and Suzu have crushes on him; Yokoshima-sensei wants to rape him; Kaedemay have developed a crush on him; and Aria and Kotomi sometimes act like The Tease around him. Later on Todoroki is added into the mix and Uomi becomes his in-law and uses it as an excuse to get closer to him.
Sahashi Minato of Sekirei unknowingly/unwillingly becomes an Ashikabi and starts what can only be described as a Battle Harem after one act of kindness, and proceedes to add two more girls to his harem, largely unwillingly (they surprised him with a kiss). Then it is subverted, as he actively pursues his next member, at his Sekirei's encouragement, directly asks if the next one wants to join (she does) and then finally chases down another.
Sgt. Frog: To date, Fuyuki has drawn the attention and affection of Momoka, Chiruyo, Alisa Southerncross, and the unnamed mermaid of the undersea Nontolma civilisation.
Don't forget Keroro's which includes Tamama, Mois, Pururu and in one episode Karara (in that episode they're all seen together, it doesn't go very well). It's also possibly included a girl who likes gunpla and Sumomo (only in the manga)
In the manga, there's also a female manga club member (who, although seemingly unnamed, was a minor recurring character) and Haruyo, a girl who befriended Sumomo.
In Shojokyuu Kurige no Shiofuki Shoujotachi, Akiho, Chinatsu, and Yuki all harbor feelings for Haruna.
Shugo Chara!, wherein the main character, Hinamori Amu, has her choice of Hotori Tadase, Tsukiyomi Ikuto, Soma Kuukai, Sanjo Kairi, or Fujisaki Nagihiko. The manga and anime both had pretty open endings, so there's not much evidence to say this is who she chose.
In Steel Angel Kurumi, Nakahito becomes the target of Kurumi, Karinka and Koganei's affections.
Nako, the heroine of the sequel Steel Angel Kurumi 2, has an entirely female harem composed of Uruka, Kurumi and Karinka.
The best known example of the Unwanted Harem and the OG is seen in the various versions of Tenchi Muyo! (Especially the one where the girls use Applied Phlebotinum to turn his bathroom into a literal harem.) Some consider it the Trope Codifier. Tenchi in Tokyo is probably the best example of this involving the Tenchi franchise as everyone's affections for him is turned up to eleven.
Tokyo Mew Mew, sort of (and gender-reversed). Ichigo, whose official love interest is the Non-Action Guy (who has his own harem of fangirls), has to deal with a bunch of other guys having feelings for her — Ryou Shirogane (Mission Control), Quiche (Villainous Crush) and the Blue Knight (Mysterious Protector). It doesn't help that the latter turned out to be said Non-Action Guy.
To Love Ru is THE shining example of this trope. Well for starters, Rito didn't ASK for a hot naked alien princess to teleport into of all places his bathtub while he was using it! (along with the subsequent Accidental Marriage!) All he wanted to do was keep trying to confess to the girl of his dreams! Nor did the poor sap ask for at least three to four different cock teases who have all but flat out asked/begged Rito to bang them, a Tsundere who secretly likes him and also wants the D (supposedly at least), despite acting like Rito is a sick pervert (though its not always his fault perverted shit keeps happening to him), two different assassins; one who will murder him if he so much as looks at her funny; and one who's intent on making Rito her servant (read Sex Slave), and that is probably only scratching the surface!
As of Darkness, roughly 10 girls all have varying degrees of interest in him and there are even a few who could potentially become part of the harem. In the end of the series, the unwanted part is played straight; Rito claims that Haruna is his number 1 and he rejects the idea of an harem (so does Haruna). However, because the finale is ambiguous, the girls are still vying for his affection and it is unknown if he will change his mind.
Kaneki/Sasaki is so badass, good looking, and a Nice Guy that he attracts several admirers both male and female in Tokyo Ghoul. Roma is a Loony Fan with an implied Villainous Crush towards him, Nico hits on him and finds him attractive, Eto has a Villainous Crush on him, Rize was attracted to him as soon as she laid eyes on him, and Tsukiyama is fascinated with him. There's also Touka's implied tsundere feelings and Mutsuki's romantic obsession towards him being revealed in chapter 114. The only one Kaneki seems to reciprocate would be Touka.
Mostly subverted in Tona-Gura!. Only three main characters (Kazuki, Chihaya and Nina) have even directly stated an interest in Yuuji. One is resistant to openly stating it, one is mainly teasing her best friend, and one is underaged to the point Yuuji does not consider her even a remote possibility. Marie may have an arguable brother complex. Hatsune seems to think of him more as a brother, and possible future brother-in-law. A new character in the manga is Haya, a bespectacled photography assistant to the Kagura siblings' absent father. She is a bag of nerves and backhanded comments that usually deflate Yuuji to the point even Kazuki defends him. At work, she is a ridiculously stern taskmaster. She is, despite being hard on him, deeply grateful to Yuuji for his assistance.
In Tower of God, Bam has the Tomboy Princess Yuri Jahad, the Empathic Weapon Black March, and the cynical princess Endorsi Jahad in his harem. He doesn't care about that, though, since he is focused on finding Rachel.
In the second volume, the Guide Hwaryun might count, and the down-on-her-luck noblewoman Yeon definitely does. She offers him her body in exchange for helping her out of a bind (he ended up helping her mostly by accident), and is quite flustered about it until she realizes he's a girl. Except he's not, as she finds out later.
Transformers: Super-God Masterforce has a gender-flipped and G-rated version — each of the boys has a crush on Minerva. Minerva herself just seems to think they're being childish.
UFO Princess Valkyrie is this, in the classic line of Tenchi Muyo! Alien princess crash-lands into a bath house, severely injuring the (young bishounen) owner in the process. Princess ends up indebted to him and stays on earth, several of her alien sisters (and her head maid) follow. Hilarity Ensues.
Uncle from Another World: Uncle ends up with three girls all vying for his affections during his time in the other world. Unfortunately to them, he is completely Oblivious to Love, and interprets some of their actions (particularly the Tsundere Elf-san) and completely hostile.
In UQ Holder!, Touta has gained the affection of Kirie, Shinobu and Mizore, as well as dubious feelings from Yukihime, Kuromaru and Karin.
Val × Love: Justified; Takuma's biggest fear is basically (any) human contact, but the Allfather, Odin, basically dropped his nine Valkyries off for him specifically to be the harem lead. Interestingly, not all of the Valkyries are even interested initially - Brynhildr in particular hates his guts for it.
Nitori from Wandering Son has a harem of sorts, both with girls and boys, though it comes off as a Deconstruction of a harem. So far Chiba has liked her, she's had a very close friendship with Takatsuki (who Nitori says she had a onesided crush on at one time), Doi is unusually into her, Seya fell for her, her friend Mako has a crush on her, and she has an (ex?) girlfriend called Anna who still likes her from the looks of it. She doesn't seem to really like the attention.
The World God Only Knows is a rare example of the lead character working for his harem. It's still unwanted though: he's only doing it because he has an Explosive Leash forcing him to. Also, said harem technically does not exist due to a Laser-Guided Amnesia effect. Although they still remember him subconsciously, they do not actively pursue him and may be followed up with someone else. In any case the male lead is pretty much free to do as he pleases... unless his childhood friend approaches.
Later it turns out some of them do remember him, and not only are they still interested, they actively need his affection to help save the world. And he is still as uninterested.
In the first arc of the final season of Yu-Gi-Oh!, Yugi has this. His attention is sought after by Vivian Wong, Rebecca Hawkins, and Anzu Mazaki. He seems to be aware of this, but just acts embarrassed whenever it comes up. Tristan and Joey seem perplexed and jealous.
Yugi had it easy compared to Bakura in the manga and the Toei anime. When he first came to Domino High, every girl in the classroom (except for Anzu of course) surrounded him. It's implied that this happened to Bakura before, because he seems to dislike all of the attention he gets. And Jonouchi sure is jealous as always.
In Yu-Gi-Oh! 5Ds, Jack Atlas has a small case of this; there are three girls competing for his attention by the second season: Mikage, Carly, and Stephanie. Eventually, he takes the Let's Just Be Friends option—or as close to it as someone like him can get—as he was never really interested, letting them down gently.
In Yu-Gi-Oh! ZEXAL, Yuma seems to have this problem with Kotori, Cathy, andAnna, but while he doesn't mind their attention, he seems completely oblivious to their true feelings towards him. In the final episode, Kotori finally confesses her feelings, but his reaction is ambiguous and his attention is mainly on Astral.
While Yuya in Yu-Gi-Oh! ARC-V is largely Oblivious to Love despite having Yuzu, Mieru and Grace after him, he's forced to take notice of Mieru's feelings solely because she's the most overt about them, calling him her 'darling' and wanting to bear his children (bear in mind that he's fourteen and she seems even younger). As if her unwanted affection wasn't enough, Yuzu also slaps him each time it happens in front of her despite him not initiating it or even being aware of Yuzu's feelings for him, let alone returning them or being in a relationship with her.
Subverted in Yuusha Gojo Kumiai Kouryuugata Keijiban: when the hero in distress first reveals their situation (in a party consisting of four beautiful women), the rest of the forum drowns them in contemptuous sarcasm. Then the hero explains that the pairs of girls mutually hate each other for political-religious reasons, and the only thing they agree on is to hate the hero for being a commoner. The forumites apologize for their earlier behavior... then the hero reveals she's a straight girl, and the forum immediately help her evacuate.
In Zombie Loan, Michiru has Shito, Chika, Zen, Yomi and a bit of Ship Tease with Shiba. It's not so much "unwanted" as "unnoticed", however.
In Gundam Build Fighters Try, Sekai has to deal with the affections of his teammate Fumina and Gunpla Battle rivals Gyanko and Shia. A lot of this bit is due to being Oblivious to Love and the latter two enjoying teasing the hell out of Fumina
My Cheat Skill Resurrection Revived Me has the main character Licht, on the run from the kingdom where he was unjustly marked for execution, head into a vacant dungeon, desperate for allies, he uses his [Resurrection] skill and finds himself The One Guy in the retinue of Demon Lord Aria. He soon after gets tasked with resurrecting the necromancer Dorothy, who was apparently executed under similar circumstances, ie having a "dangerous" skill, or so taunts Allen, Licht's former party member, and said necromancer also turns out to be an attractive woman. As of the most current chapter, there isn't any romance ... Yet, although all of the women are genuinely grateful he brought them back to life, and he treats them with respect.
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