http://tvtropes.org/pmwiki/pmwiki.php/Characters/KoishiKomeijisHeartThrobbingAdventure

The characters from Koishi Komeiji's Heart Throbbing Adventure. While they're the same as Touhou Project characters, due to Canon Defilement, they have their own page now.

For their canon counterparts, visit the Touhou Characters Page...

CONTAINS UNMARKED SPOILERS.

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Komeiji Household

Koishi Komeiji

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Debuted in: Subterranean Animism

"My hat is my friend. It helps me relax <3"

Younger sister of Satori Komeiji, with the power to manipulate people's subconscious.

Adaptational Villainy: Canon Koishi is nowhere near as psychotic and violent as this Koishi is.
Beware the Silly Ones: Incredibly silly but also incredibly dangerous in combat, despite more or less fighting on instinct alone due to being an Empty Shell, as shown by her mauling Meiling and Flandre because they annoyed her.
Blue-and-Orange Morality: Koishi isn't completely evil, but she's definitely not playing by anyone else's sense of morality and due to her heart being closed, she's just doing things as she pleases. She apparently gets better after assimilating Yukari's head.
Berserk Button: Many things can provoke Koishi into lashing out, but above all else, damaging her hat sends her into a sociopathic rage.
Cloud Cuckoolander: When she's not murderously crazy most of the time, she's rather ditzy.
Companion Cube: Her hat, which she claims is her friend.
Cute and Psycho: In a very disturbing kind of way.
Combat Tentacles: All satori creatures have this.
Dark and Troubled Past: She and Satori used to live as Puppeteer Parasites, taking control of dead animals in order to survive. Koishi's, whose host was a cat, saw the beauty of the animal world and grew curious of a young woman who married her boyfriend. Unfortunately, said woman was abandoned by her husband and left behind with her baby. She gained post-partum depression and killed the baby while Koishi was watching. Koishi took control of the dead baby to kill the mother and used her body as her new host. Unfortunately, with her new body, she heard the colective minds of a multitude in the streets who refused to help her. The strain became too much for her and she closed her eye. After that, she became the Cute and Psycho girl we see here now.
Eye Scream: Thanks to Yukari's "The Reason You Suck" Speech on Episode 19, she opens her third eye with a broken glass.
Fingore: While trapped behind a door locked up by Satori, Koishi claws at it until her nails/claws snap off.
Get A Hold Of Yourself Man: Was cut short of pulling Flandre's eye out/finishing her off by Satori slapping her, though less of a case of being brought back to her senses and more like her blindly obeying her beloved sister.
Innocently Insensitive: Tends to say hurtful things without thinking.
- In Episode 19, she makes an offhanded comment about how she's sorry about the cattle that had to die, but it was worth it for the sake of a delicious dinner. Earlier, all of Gensokyo had to die for the sake of the Lunarians's Human Instrumentality Project and Yukari notices that Koishi is implying the same thing. She doesn't take it well.
Last of Their Kind: Satori and Koishi are the last satoris in existence. Except that's not the case, the Watatsuki sisters also became satoris through unknown means.
Nightmare Face: For a millisecond, she pulls off the mother of all Slasher Smiles when she sees her hat torn apart by Flandre. And this is where the video warns you that shit is gonna get real from now on.
Talkative Loon: Koishi will talk to anyone and anything, including her hat, any one of her replacement hats (such as a shoe), and a door.
Red Herring: Played with. Everything points toward Koishi being the cause of everyone turning mad in Gensokyo due to her ability to manipulate the subconscious mind, prompting Yukari to hunt her down and kill her. Turns out that not only was she not the cause, but she was deliberately set up as this trope by the Lunarians to make Yukari fall into an ambush.
Say It with Hearts: Just read the quote above!
Sibling Incest: Downplayed, but sometimes when Koishi thinks about Satori, she can't help but mention how pretty she is, and at one point says that she wants to marry her. Subverted completely by Toyohime who says that Satori merely adopts Koishi, thus they have no blood relation with each other.
Skewed Priorities: After Satori locks her up, Koishi reflects on her actions, but concludes to herself that the reason everyone was mad at her was because she was late home, and not due to mauling Meiling and Flandre to near-death.
Supporting Protagonist: Becomes this in later episodes, where she mostly just watches on the sidelines as other characters advance the plot, either by attempting to complete the Moonlight Descent Ceremony or by trying to stop it.
Unwitting Pawn: In the end, she was an unwitting decoy used by the Watatsuki sisters to attract Yukari and have her assassinated in an ambush.

Satori Komeiji

https://static.tvtropes.org/pmwiki/pub/images/img_20220215_071129.jpg

Debuted in: Subterranean Animism

The elder of the Komeiji sisters. She is the one who took care of Koishi while being on Earth. She has a third eye that can read people's heart, which makes her and the rest of her species despised by others. She is reclusive and rarely participates in any activity that take place on the surface Gensokyo.

Beware the Mind Reader: All satori with opened third eyes are capable of this, but Satori Komeiji is particularly an expert in digging her target's deepest psyche.
Big Sister Instinct: She cares for Koishi like a sister, blood relation be damned. Her reason for agreeing in helping the Lunarians is partially because she wants people to stop ostracizing her and her sister.
Brutal Honesty: She reads Koakuma's heart and exposes her as a demon harlot who has malicious intentions and is definitely up to no good. Thanks to Satori's infamous reputation, no one in Scarlet Devil Mansion is willing to accept her words, and she gets chased away violently.
Combat Tentacles: All satori creatures have this.
Curbstomp Battle: She gets this from Remilia. In Satori's defense, it is a 1 vs 3 battle.^note
Mercy Kill: Beheads Rin Kaenbyou because she wants to spare her beloved pet from the Lunarians's cruelty.
The Mole: She turns out to be in on the Lunarian conspiracy to enact the Moonlight Descent Ceremony and is simply watching over Koishi until she completes her role.
My God, What Have I Done?: Seemingly regrets assisting Watatsuki sisters in preparing the Moonlight Descent Ceremony. She is even ready to sabotage the plan, unfortunately she's stopped by Toyohime who destroyed her host body and brought her back to the Moon by force.
Not Afraid of You Anymore: Defied. She is completely afraid of Toyohime, even the latter's mere echoing voice is enough to make her shudder in fear. Though Satori grows some spine and is willing to stand up to Toyohime, she still cannot get rid of the sense of dread whenever Toyohime is present.
Power Copying: By digging her opponent's deepest memories and fears, she can copy various spells her opponent have seen before. She can even easily copy Marisa's Master Spark without the use of mini-hakero.
Tough Love: How she educates Koishi; Satori does not hesitate to use physical punishment to discipline Koshi, as long as it is warranted and not causing any lasting injury.

Hakurei Shrine

Reimu Hakurei

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Debuted in: Highly Responsive to Prayer

"It's exorcism time."

Shrine maiden and protector of Gensokyo, and a main character of Touhou Project. She realized that someone is trying to drive all Gensokyo inhabitants into madness, so she, together with Marisa and Suika, search for the culprit.

And Then John Was a Zombie: Ends up being turned into a Kaiju alongside the rest of Gensokyo's inhabitants.
Barrier Maiden: She still has this ability, even after being turned into a Kaiju.
Dark and Troubled Past: She used to be a rogue youkai exterminator before being recruited by Yukari to be a shrine maiden.
Dying as Yourself: Despite being turned into a kaiju, Reimu was able to hold onto her sense of self. Before delivering a suicidal attack with Kaiju Marisa, Kaiju Reimu tearfully admits that she loved living in Gensokyo and resolving incidents with Marisa.
Killed Off for Real: She and Kaiju Marisa deliver a suicidal attack on Yorihime, killing the Lunarian but losing their lives in the process.
Last Stand: She tries to deliver one against Yorihime, but fails and the Hakurei Barrier is subsequently destroyed. She has the opportunity to do it again, as a Kaiju, and she succeeds this time.
Together in Death: She and Marisa perform a Suicide Attack together to kill Yorihime.
Trauma Conga Line: When fighting against Yorihime near Hakurei Shrine entrance gate, Reimu suffers third-degree burn, gets stabbed in the stomach, is forced to witness Remilia and Kanako's death, and proceeds to get mocked by Yorihime about her inability to defend her own shrine, let alone Gensokyo.

Marisa Kirisame

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Debuted in: Story of Eastern Wonderland

A magician who used to be one of Reimu's enemies, then befriends her and becomes protector of Gensokyo. She's another one of the main characters of Touhou Project.

And Then John Was a Zombie: Ends up being turned into a Kaiju alongside the rest of Gensokyo's inhabitants.
Go Out with a Smile: She's last seen in the series grinning as she's dying from her injury. Safe to say that Marisa has no regret.
Just in Time: Just as Kaiju!Reimu is about to get blindsided by Yorihime, Kaiju!Marisa sweeps in for the assist.
Killed Off for Real: She and Kaiju!Reimu deliver a suicidal attack on Yorihime, killing the Lunarian but losing their lives in the process.
Sociopathic Hero: A borderline one. She states that her time studying magic had killed off her capacity for emotion, demonstrated clearly with how she is does not react at seeing her father's corpse, and the only reason she isn't a complete sociopath is because of the bonds she built with people like Reimu and Alice. Also, she sees herself as being an evil-fighting book heroine (in fact, the only reason she even built a grave for her father was because she read a book in which its heroine does the same) and follows through with the tropes inherent with that kind of story, such as being protected by Plot Armor.
Together in Death: Dies together with Reimu after performing a Suicide Attack with her to kill Yorihime.
What Happened to the Mouse?: Before Gensokyo is destroyed, she's last seen with Alice about to confront Byakuren. It’s unknown what happens to her after the Hakurei Barrier is destroyed. However, the finale reveals she turned into a Kaiju monster.

Yukari Yakumo

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Debuted in: Perfect Cherry Blossom

The mysterious "youkai of boundaries" and one of the most powerful beings in Gensokyo. After realizing that someone is trying to drive all Gensokyo inhabitants into madness, she believes it's Koishi's doing, after the ruckus she caused at the Scarlet Devil Mansion and her ability to manipulate the subconscious mind, prompting Yukari to hunt her down.

Adaptational Wimp: Despite being one of the most powerful characters, she wasn't able to realize the ensuing chaos in the Outside World and the Lunarians' Batman Gambit. She's killed by Reisen II and assimilated by Koishi, though she gains control of her body after seeing Reimu on the verge of death and tries to kill Yorihime, the one who hurt Reimu, with a stick. She fails and is forced to watch as Gensokyo is destroyed thanks to her own obliviousness.
Big Good: She's the main person trying to stop the cause of the madness. As of part 18 of the finale, she's one of the few Gensokyo residents left alive and the only one in a position to do anything.
Nice Job Breaking It, Hero: Because she was too busy tracking the one who drove the Gensokyo's inhabitants into madness, she was unable to see the Lunarians' plot in the Outside World.
"The Reason You Suck" Speech: She gives one to Koishi after the latter is uncaring about everyone else in Gensokyo being dead. It works and Koishi finally opens her third eye.
Portal Cut: Yukari uses her gaps to cut off all of Koishi's limbs simultaneously. And then gives her the guillotine treatment.
Sharing a Body: Koishi assimilates Yukari after the latter is killed by Reisen II, with Koishi being the dominant personality. Though Yukari regains consciousness for a while upon seeing an almost-dead Reimu.
Survivor Guilt: After regaining her body and will in Episode 19 (Part 8), she blames herself for surviving alongside Koishi when everyone else in Gensokyo (except Patchouli) had died.
There Is No Kill Like Overkill: Reisen II kills Yukari by detonating a bomb implanted inside Ran's stomach, then emptying her rifle ammo on her, then by detonating another bomb implanted inside Chen's stomach.

Scarlet Devil Mansion

Remilia Scarlet