Akuma no Riddle: Each of the girls get their own image song in the end credits. Except Shiena, poor thing.
Multiple major characters in Anpanman have an image song, most of them sung by their voice actors, with a couple sung by the musical duo Dreaming. A shortened version of Anpanman's song is the theme song for the whole series. For multiple characters, an instrumental version of the image song will be used as a leitmotif for their scenes. An interesting case is the Donburiman Trio: they each have their own song that they sing in-show, but their image songs are different (Tendonman's has slightly modified lyrics, Katsudonman's is tacked on to the very end of his image song, and Kamameshidon's is completely different). It's also common for very major characters to have more than one image song (Baikinman has one that glorifies him and another one that basically spells out his defeat).
Aria the Scarlet Ammo has a few, notably "First Contact" and "Ring a ding on, Riko-rin" for Aria and Riko
One episode of Azumanga Daioh features some of the characters singing their image songs as karaoke. Interestingly, some characters turn out to be horrible singers in the "reality" of the show, whereas their voice actors are always at their best on the CDs (even when in character). In a later episode, when Yomi's listening to the radio, the DJ starts to play a request: "The Heart is a Girl's Parachute" by Asakawa Yuu. This is Sakaki's image song and voice actor. They also use Tomo's image song, "Poi Poi Peace", as her ring tone.
All twenty-three Bakemonogatari openings are this, as they're each sung by one of the female characters' voice actresses and the songs themselves are meant to convey who they are as characters.
Bamboo Blade: Each of the five main character got their image song. Sayako's song "Only Track" , sung by Sachiko Kojima was featured in the first soundtrack album. Kirino's song "For You Shine" and Tamaki's one "Sunflower", respectively by Megumi Toyoguchi and Ryō Hirohashi, in the second soundtrack. Miyako's song "All in all", by Houko Kuwashima, and Satori's song "No looser", by Rina Sato, where included in the drama cds.
Oddly, Black Butler has these. Characters who got songs are Sebastian, Finny, Grell, William, Lau, Undertaker, Agni, Soma, Viscount Druitt, and Ronald.
Several of the Bleach characters have Image Songs released on CD, though they have never appeared in the anime itself.
Some of the earliest examples of image songs may well be found on the various soundtrack albums released for Bubblegum Crisis in the late 1980s and early 1990s.
Dancougar has some sung by the voice actors themselves. Some of the notable ones are Ai Wa Zankoku No Fairytail and Ai Wa Shitta Yajuu No You Ni. The former was sung by the entire Juusenki Tai, the latter's just Shinobu.
The Di Gi Charat franchise is extremely guilty of this trope, with lots and lots of discs and singles released. Somewhat justified since the main characters want to be idols and the franchise itself born as an marketing strategy. There was even a crossover CD with Galaxy Angel featuring characters with the same VA.
In a German example, the first album of Digimon put out by RTL II has Mimi's Song, while the second one has Matt's Song.
Digimon Data Squad did eventually get an Image Song CD, but Yoshi and Lalamon were missing altogether. Frustratingly ironic, as their Back Story is that they met after Yoshi failed in a piano recital and Lalamon has an attack called Sing A Song which does Exactly What It Says on the Tin. Later in the year, another CD was released that included all new songs from the five "goggle boys" for Digimon's tenth anniversary (bonus points for one of the songs being called "GOGGLE BOY").
Dragon Ball has received many of these from over the years:
The Dragon Ball anime started the practice with the Red Ribbon Army arc, including "The Son Goku Song", "The Teachings of Master Roshi", and "Red Ribbon Army" for the villains themselves. "Wolf Hurricane" was also introduced and used for Yamcha's fight with Tenshinhan in the next arc. These supplemented several Insert Songs as well, such as "Aim to Be the Greatest on Earth", "Mystery Wonderland", "The Dragon Ball Legend", "With A Burning Heart! Defeat the Red Ribbon Army!" and "The Blue Travelers".
Durarara!! came out with character singles for Mikado, Kida, Shizuo, Kadota, Anri, Shinra, Izaya, and Celty. All the songs are covers of old songs from anime or otherwise. For example, Celty's song is a cover of "Message in Rouge," the Japanese theme from Kiki's Delivery Service.
There are five Fullmetal Alchemist (2003) image song CDs, with three image songs each, one for Ed, Al, Roy, Winry and Hughes. And of course, there's the compilation CD with all of those on it, plus a few group songs. Sheska joins Winry for a duet (likewise Riza Hawkeye does one with Roy, and Hughes' daughter Elycia joins her daddy for an absolutely adorable song). The Homunculi manage to get in a really strange talk session set to trance music, when an Elric brothers duet probably would be a much better choice for Al's CD.
Meanwhile in America, Vic Mignogna (Ed's voice actor) wrote an unofficial tribute song in this style called "Nothing I Won't Give".
Fushigi Yuugi had quite a few of these, most of the main characters had two image songs. A few of these were used in the series to punctuate serious moments i.e. character deaths. Notably, several of the image songs were actually background music from the show with lyrics.
Mobile Fighter G Gundam has five OST CDs, titled Gundam Fight Rounds 1-5 (though 1-2 are a two-disc set). Round 5 features image songs from most of the main cast, although while Domon Kasshu gets two songs of his own and a duet with Rain, Sai Saici and Argo Gulskii have to share "China Shuffle". And Argo's singing voice has to be heard to be believed.
Mobile Suit Gundam Wing has four OSTs, five if you include Endless Waltz; out of those, two are peppered with Image Songs, while a third is given over to them entirely (the only non-Image Song track being the show's second opening theme). Most of the primary cast gets songs, with the central characters (the Gundam Pilots and Relena) getting at least two while lesser-but-still important characters like Zechs, Treize, Lady Une, and Dorothy each get one. The 2-CD Audio PlayBlind Target features an additional song for each of the five pilots.
Mobile Suit Gundam SEED Destiny's second OST features "Shinkai no Kodoku", Stella Louisser's image song, which is also an insert song for her important scenes in the series, particularly her chance meetings with Shinn, her death scene and Shinn interring her body.
Haruhi Suzumiya, thanks to its immense popularity, put out 9 character albums, 4 soundtracks, 3 drama CDs, 8 combination soundtrack and drama CDs that shipped with one of the DVD versions, a live concert, an orchestral concert, followed by 7 more character albums for the 2009 re-airing from the Five-Man Band, plus Tsuruya and Taniguchi. All this for just 28 episodes! Emiri Kimidori, who only appears in a single scene for less than three minutes, gets a CD (although she later received an increased role in the later books that hadn't yet been adapted), and Churuya has 6 image songs. Naturally, the Gender Flip faction has redone even these image songs. And they're GOOD.
The "Butler Network" segment advertises the show's image songs in a very direct, No Fourth Wall kind of way, including having Nagi wonder how well her song is selling.
Although not technically her character song, Hinagiku sings the ending of season two, it could fit for it though. Also for the second ending of season two, Hayate and Nagi sing, what could be considered, an image song.
Aside from the Season One mini-albums for the major characters (containing 2 songs, karaoke tracks, and interviews), there are a few albums for Season 2, The Movie, Can't Take My Eyes Off You, and Cuties with a few characters tracks for pretty much everyone - notably most characters got an Image Song for the ending of their personal episode in Cuties.
Music CDs exist for the eight main characters (or nine, since Italy's seiyuu does a song for North and South Italy). They also sing their own versions of the Ending Theme of the anime, which are included as extras on the DVDs. The endings for the first four seasons were all compiled into two CDs, and feature versions for other countries such as Poland and Lithuania.
The movie has "Wa! Wa!! World Ondo", in which the eight main characters all sing together, and the "Character CD Perfect Guide" gave Prussia his own image song "Mein Gott!" as well as a joint image song for Chibitalia and Rome called "Ren Ren Renaissance".
Then there are songs for Ukraine and Belarus, Prussia's other song "Song of the Awesome Me", "With Love From Iceland" with Iceland and Puffin, the digital-release songs for Hong Kong, Taiwan, Canada, and Rome (which were all put together along with two new songs; one featuring the Baltics, and another featuring France, Spain and Prussia in a commercially-released CD), as well as the songs from the Interval CDs featuring Prussia, Spain and the Nordics respectively.
In 2015, eight more CDs were released to tie-in to season six, featuring the main eight, Prussia, the Nordics, Estonia and Hong Kong.
Both seasons of Hidamari Sketch have these, though much more extensively in the second season. Even the Principal gets to sing.
JoJo's Bizarre Adventure: The Anthology Songs is a collection of three albums sung by Hiroaki "TOMMY" Tominaga for the first, the second by Coda, and the third by Jin Hashimoto, the artists who sang the openings for Parts 1-3 respectively. Each album contained a remix of the artist's opening, three image songs, and karaoke versions of each. Jonathan Joestar and all of the Stardust Crusaders got one song, aside from Joseph Joestar, who got two. One represented him during his own part, Battle Tendency and the other for him during Stardust Crusaders.
K-On! has two for each of the five main characters, as well as for some of the side characters.
Standard practice in Lyrical Nanoha is to include three tracks worth of Image Songs in each Sound Stage as extra incentive to buy them. Nanoha and Fate naturally gets a good chunk of these, with Hayate a close third.
Lucky Star has a large collection of image songs thanks to its overwhelming popularity. And it's not just the four main girls, either. Kagami's classmates and even Konata's deceased mother get songs. Misao, formerly one of Those Two Guys, became enough of an Ensemble Dark Horse to get an album all to herself. Shiraishi got more songs than anyone else thanks to him taking the lead for the second half of ending songs. One of the songs that got a full version was none other than Ore no Wasuremono.
Magic Knight Rayearth often mixed image songs along with traditional soundtrack themes. Although they were usually performed by Hikaru, Umi, and Fuu, sometimes Emeraude and Eagle would get a chance to perform. Even Mokona got in on the fun with at least two songs.
Marginal Prince features a song by any of the characters in focus of the particular episode - episode Nine even features three of them. This was probably mainly done to promote the game the anime is based on, as it main feature is the songs as a "reward" for completing a character route. Luckily, mostoftheseiyuu are good singers. Unfortunately, not all songs from the game made it into the anime series (but therefore, some new ones were created).
Mekakucity Actors, being the anime extension of Kagerou Project (a Vocaloid project) has a ton of these. Every character gets at least one (Takane and Mary get two, Momo and Hibiya get a joint-second), plus several other 'plot-based' songs. There are 23 songs in total, with one actually topping the 2013 Yearly Vocaloid Rankings.
Mermaid Melody Pichi Pichi Pitch, being a musical, uses every image song in the episodes, as well as every other song in the vocal box.
Minami-ke has a few image song albums; in addition, the soundtracks include versions of the opening and ending themes by each of the three sisters.
Monster Musume has a soundtrack CD for each of the girls, each one consisting of two original songs, the featured girl's version of the anime's opening theme, and instrumental versions of the original songs.
My Bride is a Mermaid has a massive collection of image songs to its name, most prominently by San and Luna. Magic Music is such a major part of the show it was to be expected.
My-HiME gratuitously inserted three image songs - one for each of the main players - into the show in episode 15. The show also got two full albums full of image songs for just about all of the main characters.
Negima! Magister Negi Magi features all thirty of the girls from Negi's class, alone and in combinations. The Opening Theme for the second anime features several re-recordings by different combinations of the girls, which were then used for the actual opening of different episodes. Many of the important characters (i.e. Ala Alba) are given their own songs as well.
Nichijou has character songs for most of the characters: Yuuko, Mio, Mai, Nano, Hakase, Sakamoto, Misato, and Sasahara each get a CD with two songs sung by their voice actor, and an instrumental version of each song.note Mai actually gets two, her character song album and the CD "Mai Pace". Another CD has one song each for Annaka, Sekiguchi, Ms. Sakurai, Dr. Nakamura, and Principal Shinonome.
Ojamajo Doremi had four songs for each girl * Five for the original trio. by Dokkan, though Pop still only had two (and one wasn't even sung by her seiyuu). There are also two separate CDs featuring songs sung by their classmates and teachers.
One Piece has quite a few image songs for the Straw Hats and for other noteworthy characters like Shanks and Mr. 2. Some of the Straw Hats' image songs have only one character singing, but there are often ones with multiple characters (for example, Hurricane Girls features Nami and Robin), or the entire crew. At one point during the Skypeia arc, Luffy and Usopp sing one of Sanji's songs. Badly.
Ouran High School Host Club has some very fun image songs, as well as a song sung by all of the characters together. Noticeably missing is Haruhi's image song, and she only speaks in the group song. This makes sense as canonically, she's a horrible singer.
Pretty much the entire vocal soundtrack of Pani Poni Dash! is sung by the characters involved.
The Pokémon anime series has Satoshi's (Ash's) themes "Spurt!" and "XY&Z" which are openings, Haruka's (May's) theme "Watashi Makenai", Hikari (Dawn) has "Kimi no Soba de", Serena has "DoriDori" and Eureka (Bonnie) has "Puni-chan no Uta" (with all of their themes used as an ending theme of their saga). Instrumentals of these are usually heard during their contest appearances. Team Rocket have "Rocket-Dan Yo Eien Ni" which they have occasionally sung in place of their motto. Takeshi (Brock) has "Takeshi no Paradise", originally an Ending Theme which he later started singing in episodes whenever there's a need for some kind or distraction. And Kojiro (James) has "Lucky Lucky", a flirtatious Hurricane of (Pokémon) Puns. Vocal versions of both these songs have made it into the dub.
In a rare English language example, soundtrack CDs titled Pokémon 2.B.A. Master and Totally Pokémon were released by 4Kids in 1999 and 2001 respectively that feature Image Songs associated with characters and themes from the first two generations of the show. Barring spoken lines by the characters throughout the songs, however, the songs are not performed directly by their English voice actors (with the exception of "Double Trouble", sung by Rachael Lillis, Eric Stuart, and Maddie Blaustein in-character as Team Rocket, and "Two Perfect Girls", sung by Eric Stuart as Brock). Later, the musical theater show Pokémon Live! would feature some of the songs from those soundtracks (technically predating Totally Pokémon), albeit sung by the stage actors (again, with the exception of Maddie Blaustein as Meowth).
Interestingly, abridged versions of the songs were featured on the English version of the show itself in the postshow segments "Pikachu's Jukebox" (for the second half of Indigo League and all of Orange Islands, replacing the Pokérap) and "Pokémon Kareokémon" (for Johto League Journeys), essentially creating an English-language equivalent of the common practice of multiple ending themes for anime.
Even thirteen-episode Prétear has image songs for the four older Leafe Knights on the second soundtrack CD.
Every season has at least one album comprised of image songs for the characters. These songs would be used in the series' musical shows, and, beginning with KiraKira★Pretty Cure à la Mode, the concerts where the voice actresses would perform.
Urara from Yes! Pretty Cure 5 has two Image Songs which, in the show's reality, she wrote herself. She regularly sings them in concerts, accompanied in at least one case by the rest of the main cast.
Interestingly, the second vocal album for Smile PreCure! gives its villains an image song. "BAD END ~Future Stained Black~", performed by the core villains sans Joker, has lyrics about their plans to infect the world with misery.
Doki Doki! PreCure: Being an idol, Makoto Kenzaki has several songs she sings as an idol. There was even a CD released of all her character songs.
Kira Kira Pretty Cure A La Mode is one of the rare series to actually use the character songs in-series. For example, Cure Whip's "Add The Berry To My Big Love" plays over a cooking sequence in episode 1.
HuGtto! Pretty Cure: Midway through the series, Emiru and Lulu form the idol group Twin Love, and perform 3 songs together.
Star★Twinkle Pretty Cure: Mao, a space idol, occasionally performs her image song, Cosmic Mystery Girl, in-series.
Laura in Tropical-Rouge! Pretty Cure performs a song called "Song of Friendship" in episode 13; this song would be later used as a leitmotif for the character.
Delicious Party♡Pretty Cure, like Smile, also gives a non-Cure an Image Song; in this case, ally Rosemary has an image song about confidence and beauty.
A more extreme case is The Prince of Tennis, which keeps delivering image songs, duets, group releases and/or image CD's for almost each player in the show in a more-or-less regular basis. It's gotten to the point where the number of image songs is probably somewhere near four hundred.
Psychic Squad, being done by the same creative staff as Hayate, has a pretty large collection to its name. There are songs for the expected characters (The Children) and some less expected (Muscle Okama?).
Puella Magi Madoka Magica has Madoka's See You Tomorrow and Kyouko's and Sayaka's duet And I'm Home.
Song Calendars and the "Hot Song Battle Contest" album display the voice actors singing wholly in character, sometimes purely for humor (such as Genma trying to sing while in Panda form), but for surprisingly dramatic effect at other times (girl-Ranma singing an unusually angsty song while crying in the rain).
The juxtaposition of Akane's two song really shows her Tsundere nature. Her infamous Baka Song shows the tsuntsun, while Akane's Lullaby is very deredere.
A little in-joke for the fans was the duet by Ryouga and the Jusenkyo Guide - the two characters share the same voice actor.
Reborn! (2004) gives an image song to Gola Mosca, a machine who can't talk, much less sing. Instead he makes depressurizing noises from his exhaust ports which sound like creepy breathing. One of the Anime's endings was Sakura Addiction, a duet Image Song for Hibari Kyouya and Rokudo Mukuro.
Rem from Re:Zero has a song titled "Wishing", which played during the latter part of Episode 18. Additionally, the second ending theme, "Stay Alive", is one for Emilia.
Ronin Warriors has many soundtrack CDs, often containing image songs. Touma's singing voice is infamously bad and most of the others aren't much better - but a lot of the songs, especially groups, are fun anyway.
Rosario + Vampire has a usual share of image songs in both its seasons, as well as covers of 80's J-Pop songs. In both seasons, all of these have been gratuitously inserted into the anime, with the poolside karaoke in season one and the singing in class in Capu2 being the most obvious.
The Rozen Maiden drama CDs all feature image songs to their respective dolls, sans Kirakishou, who doesn't have any drama CD.
The Saga of Tanya the Evil's first ED, "Los! Los! Los!" is one for Tanya herself, performed by her VA, Aoi Yūki. It elaborates on Tanya's feelings toward warfare, especially that one should end the Cycle of Revenge it causes by obliterating the enemy so utterly that they can never recover from it.
Rurouni Kenshin had quite a few image songs, though they were not actually used in the show. These included songs for characters from mini-arcs.
The anime has image songs and singles for central characters in almost every season; only some of them actually appear in the show. There was also a CD of image songs sold in North America called "Lunarock!", which featured songs that appeared in a few episodes. Sailor Moon had more than one for herself on there, unlike common anime practice in Japan different voice actresses were used to sing for the girls, due to the album being recorded in L.A and the voice talent for the show being based in Canada.
Saiyuki has numerous image albums from the three separate anime series and almost every major character has at least one song. And try not to count how many the four main characters have, you'll give up half way through. The only exception is Hakkai, since Akira Ishida doesn't like to sing—when Hakkai absolutely needed an Image Song as part of the "Four Seasons" promotional CD for the movie, he simply delivered a monologue to music. This has led original author Minekura to playfully refer to the group of Goku, Gojyo and Sanzo's seiyuu as "-8," or "Minus Eight," as the "ha" in "Hakkai" is written with the kanji for 8.
The Hit Square Character Songs of Saki, a music CD containing the Image Songs of the two most popular characters from each of the four teams.
Shugo Chara! has three "Character Song Collections".
Sister Princess had an extensive soundtrack with solo and group songs for all 12 of the sisters.
Slayers has between one to three image songs between each of the major characters (including one of the villains, Valgaav), and there is both the infamous "Maiden's Prayer" duet by Lina and Amelia's voice actresses from the second season of the anime, and a song where the four leads all sing together. The opening and ending themes (sung by either Masami Okui or Megumi Hayashibara, or both) are all Image Songs for heroine Lina Inverse, as they tend to describe her personality directly.
The anime Soul Eater has several albums of songs from the anime out along with at least three image albums out. The image albums each include one song (along with two other versions of the same song and a song from the anime not sung by the voice actors) sung by the Japanese voice actors. Soul Eater Evans along with Maka Albarn have a song sung together, Black Star and Tsubaki have a song sung together, and Death the Kid along with Liz and Patty Thompson have a song sung collectively. All of the tracks are quite awesome.
Sound! Euphonium has four image albums focusing on Kumiko, Hazuki, Sapphire, and Reina released to tie in with the first season. Each album has two songs performed by the character's actress, as well as a recital of the character's orchestra instrument (euphonium, tuba, contrabass, and trumpet respectively). Interestingly, Hazuki and Sapphire were Demoted to Extra later in the series, while characters who became more prominent (like Asuka, Mizore, and Nozomi) didn't receive image songs.
Spirited Away has an image album, unusually for a standalone film. Probably the highlight is No Face's oddly bouncy song about his loneliness.
Strike Witches has image songs for the entire cast as well as many duets. With five CDs, covers by each girl for a song from their respective country from around that era, and a solo for each character (Yoshika got two solos) The ending theme for both seasons are sung by different cast members each episode as well. So far one of Sanya and Eila's duets, "Sweet Duet" has inserted into the end of season two's sixth episode.
Sunday Without God: Protagonist Ai has a beautiful song called "Hohoemi no Ame," released as a bonus for the first press edition of the original soundtrack.
Sword Art Online has them for Kirito and almost every female main character (Asuna, Leafa, Sinon, Lisbeth, Silica, Yui, and Yuuki), featured on the bonus discs included with the Blu-Ray sets of the series. Several of them have multiple cast members singing at once.
This is actually the theme of Symphogear. Every Symphogear has at least two image songs per season and at least one of them is used in the anime. This is justified because their powers can only be displayed when they sing. There are also some other songs and duets they do.
The Tenchi Muyo! series — or group of series variants — has released a whole lot of CDs, including a Christmas album. Characters have several songs that could be Image Songs, and some made their way into the first television series (which followed, and re-structured, the OVA), during karaoke on-board ship. A few of these were released in America by Pioneer, including one CD called "Meet The Tenchi Muyo" that mimicked the appearance of several Beatles albums.
Kamina and Simon do a duet by the name of "Break Through the Dream." It is filled with about as much manliness as you can cram into a song.
Yoko has two "Trust" and "S.t.a.r.S.", the latter of which also has it's own full-length music video depicting Yoko's inner Idol Singer... and then Yoko with her inner Idol Singer. As can be expected from the series, it's actually quite awesome.
Tiger & Bunny has a few: "GO NEXT!!" and "My Song" for Karina/Blue Rose, "POWER OF JUSTICE" for Barnaby, and "Hamidashimono Sanka" for Kotetsu/Wild Tiger. "Seigi no Koe ga Kikoerukai" is a a duet with with Kotetsu and Barnaby while "Natsu no Koi wa, Otsukare Summer" features all three of these characters.
Tokyo Mew Mew has two character songs for each Mew Mew — except Mew Ichigo, who got five.
Toradora! has a CD of character songs sung by each of the five main characters, plus ones for Yasuko and Yuri-sensei, and two songs sung together by Yui Horie, Rie Kugimiya, and Eri Kitamura: "Frascoration" and a remix of the ending theme "Orange".
Tsubasa -RESERVoir CHRoNiCLE- has these for all of the major characters: Syaoran's being 'Kizuna,' Sakura's being 'Towa no Omoi,' Fai's being 'Smile,' Kurogane's being 'Zankou,' and Mokona's being 'Tabi no Tochuu de Kibou no Uta wo Utaou'. Though really, Yuui Makino (Sakura's Seiyuu) actually sings quite a couple of songs for the anime.
Wagnaria!!: Takanashi, Popura, Inami, Yachiyo, Sooma, Satou and Yamada have their own image songs, plus their own versions of the song "Wagnaria Sanka." Additionally, the opening and ending theme songs for both the first and second seasons are sung by the voice actors themselves, while in character.
Another rare English language example, (also courtesy of 4kids no less) is the Yu-Gi-Oh: Music To Duel By album which features "Face up Face Down" a theme song for Maximillion Pegasus sung by his voice actor Darren Dunstan.
Zettai Muteki Raijin-Oh is quite generous with its image songs; the three pilots and The Heart get two or three each, and the remaining 14 main characters each get a song. Even the villains get a shot in a "karaoke showdown" themed song.
Zombie Land Saga: As of Season Two, every member of Franchouchou (besides Tae, who can't sing) has gotten at least one song dedicated to them:
For the group as a whole, "Mezame Returner". It's one of the most reoccuring songs in the series, being played at some of Franchouchou's most important concerts across both seasons. It also has an autotune remix that occurs when the girls get a lightning-induced surge of power.
"Tokkou Dance ~DAWN OF THE BAD~" from Episode 9, a 90s punk rock song about achieving what you want in your life, by relying on the friends who are on your side.
Ai gets one, sort of. "Fantastic Lovers", despite being a song from the original Iron Frill team, is mostly sung by Ai.
Junko gets to perform one in Episode 3 of Revenge, known as "50 and 4 Things Left Behind". It was the first hit that Junko had back when she was alive.
Yugiri has an entire song dedicated to her love-life problems (and hints at the incident of Saga as a whole in the Meiji era) known as "Saga Jihen", included as the main highlight of the "Best of" album, and which she sings in the show in Episode 9 of Revenge.
Lily also technically has two songs to herself:
First, there's "To My Dearest" from Episode 8 (which has a special piano version from the "Best of" album).
Then there's Lily's scatting remix of a song called "Life" that's known as "Little Bodda Bope" in Episode 5 of Revenge.
While Tae can't sing, that didn't stop her from getting a cute Insert Song, known as "Today's Curry, Yay Yay Yay" in Episode 6 of Revenge, dedicated to her.
to Irene's "Shippu."