A page detailing the cast of Irisu Syndrome. Spoilers are unmarked.
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Kyouko Irisu
Those two were happily talking again today.
The player character, a mentally ill university student. She befriended the trio of Uujima, Ageha, and Edogawa, harboring a crush on Uuji. Unfortunately, this crush manifests as a desire to kill Ageha — who also loves Uuji — and Edogawa, as well as Uuji himself. She spends the game fighting against her desire to murder, and whether she succeeds or fails is dependent on the ending.
- Addled Addict: She's addicted to a cough medicine that she eats by the packet, and while she was already completely nuts, the medicine isn't doing her any favors.
- Animal Motifs: Irisu loves rabbits, felt deeply connected to the class rabbit, and wears a pair of bunny ears as part of her outfit.
- Be Careful What You Wish For: She wanted Uuji to love her. He did, in a manner of speaking.
- Becoming the Mask: If Irisu's insanity is beaten back enough, she develops genuine affection for Ageha and Edo.
- Berserk Button: She hates cats.
- Big Bad: Subverted; it’s Uuji who is manipulating her.
- The Chessmaster: When she needs to be. She alone convinced everyone to go on the trip, so subtly that only Uuji noticed that was her plan all along.
- Combat Pragmatist: Her murders are strictly cold-blooded; she lures the victims to an isolated area, splits them up, and doesn't say a word as she beats them to death.
- Commonality Connection: With Uuji, because they were both always alone.
- Cute and Psycho: You wouldn't expect a girl with fluffy white hair and big anime eyes to be a murderer, but Irisu has always defied convention.
- Determinator: Presumably the reason that she can manipulate people despite being pathologically afraid and ignorant of social interaction.
- Evil Cannot Comprehend Good: Irisu doesn't understand why she sabotages her own plot during her brief periods of sanity.
- Glowing Eyes of Doom: Her eyes occasionally glow, through unclear methods.
- Love Makes You Crazy: Irisu's mind wasn't in a good place before she fell for Uuji, but at least she wasn't going around killing people.
- Longing Look: Often directed these at Uuji in class. She was totally content with their 'relationship' never progressing beyond this.
- Maybe Magic, Maybe Mundane: Her occasionally glowing eyes.
- Mood-Swinger: She's either passive as wallpaper or in total 'I-will-kill-you-bitch!' Tranquil Fury. There is no middle ground.
- Only Friend: Uu-tarou the bunny was hers. She was really screwed up by his death.
- The Quiet One: Never speaks if she can help it. Even her murders are carried out in complete silence.
- Rousseau Was Right: There is a tiny part of her that doesn't want to hurt anyone, though it is often buried by madness. She would not play the game if she weren't trying to strengthen this part.
- Shrinking Violet: In her saner moments.
- Smarter Than You Look: How she's functional in daily life is a mystery, but she's capable enough to attend college, elude police for some amount of time, and reference brain anatomy while high as a kite.
- Spock Speak: Her written instructions for the camp are formal and use unnecessarily technical words.In the hopes that you don’t show unnatural behavior, I earnestly thank you.
Please appropriately make up some ghost stories. - Sure, Let's Go with That: In the best ending, she decides to let everyone live even though that wasn't her original plan.Well, this is also fine.
- Unwitting Pawn: Her plan is her own, but she has no idea that Uuji is deliberately influencing it.
- Villain Protagonist: She's even built up as the Big Bad... but then it turns out she is being manipulated by Uuji.
Satoshi Uujima
However I can express it is fine.
One of the three university students on the trip. Though seemingly a normal, cool-headed guy, he's actually a psychotic, unstable manipulator who is in love with Irisu and wants her to kill their friends — Age and Edogawa — and then him as well. He also murdered Irisu’s rabbit, in a twisted effort to help her make friends. It backfired magnificently.
- Accomplice by Inaction: Not only is he fine with Irisu murdering Edogawa and Ageha, he wants her to kill him as well!
- Becoming the Mask: He himself was surprised that he accepted Edo and Ageha's friendship.I think it's strange.
Why do I care so much about being with people I barely know? - Beneath Notice: Around people, he likes to act blandly agreeable for this reason.
- Big Bad: He manipulates Irisu into trying to kill Edogawa and Ageha.
- Birds of a Feather: He both recognizes and accepts Irisu's...love?...for him, even though she's never mentioned it to him and is batshit crazy. They're just on the same wavelength like that.
- Cannot Spit It Out: He claims that the reason he didn't speak to Irisu during their childhood was that he didn't want to worsen her asthma, then immediately admits that he was just lying to himself. In reality, he was just too shy to approach her.
- Clothing-Concealed Injury: Always wears long sleeves to hide the scars in his wrists.
- Dark Secret: He self-harms repeatedly and keeps his scars hidden so others won't comment on them.
- Death Seeker: Again, he wants Irisu to kill him.
- Every Scar Has a Story: He remarks ambiguously that the bruises on his arms 'memorialize' Uu-tarou. This implies that they are self-inflicted.
- First-Person Smartass: He rarely tells anybody his true feelings about them, but the main topic of his internal commentary is how everyone (including himself) is stupid and could easily attain a happier ending than the one they're headed for.
- Guilt-Induced Nightmare: He dreams about red eyes glaring at him accusingly. (Whose eyes they are is not said.)
- Hope Is Scary:
- Admits he'd like to be with Irisu, but thinks it would be easier for her to kill him than confess his feelings.
- He also admits he'd like for him, Irisu, Ageha and Edo to get along, but thinks it would be easier for Irisu to kill them all.
- Ignored Epiphany: As the trip is starting, he realizes through monologue that he actually really likes his friends and could have a happy life if he only put the effort in. Then he concludes it's "too much trouble."
- Karma Houdini: In all the endings, he either gets what he wants or gets away without anyone finding out what he's done. The closest thing to redemption he gets is in the Metsu ending, where he tries to keep everyone together, but he's clearly not learned his lesson from it.
- Love Hurts: All Uuji could think of when Irisu befriended Uu-tarou was how sad she would be when it died. By the time he's in university, his belief that love and pain are inextricably connected has morphed into a fetish.
- Love Makes You Stupid: Even as he wonders whether Edo and Age would accept his scars, he claims they would be stupid to do so.Would they treat me the same way as they've always done?
They probably would. Because they're idiots. - In Love with Your Carnage: He thinks it would be "romantic" if Irisu killed him and then herself.
- Mad Artist: He only draws a very specific, morbid subject: cat corpses. Naturally, the subject reflects an incident in his Dark and Troubled Past.
- Mellow Fellow: The facade he wears to avoid attention is that of an agreeable, quiet guy who doesn't have real opinions about anything.
- Mind Screwdriver: The story is Irisu's, but it doesn't make a lick of sense without Uuji's exposition.
- Nightmare Fetishist: He finds Irisu's erotomania hot and does everything he can to enable it.
- Non-Action Big Bad: He never actually does anything, other than changing what he draws in a very non-intuitive plot to rouse Irisu's jealousy. He's terrible because he could prevent his friends' murders but doesn't.
- Shipper with an Agenda: He ships Ageha with Edo not because he cares about either's happiness, but because he finds Ageha's flirting annoying.
- Social Services Does Not Exist: It is unclear if Uuji even has a family — he never mentions one.
- Tsundere: One reason he inflames Irisu's psychotic rage is to make her interact with him.
- Unreliable Narrator: In one diary entry, he claims that he doesn't care about Ageha and Edo mocking him, and in the next, he mentions having an argument with Edo over it.
- He also looks down on Ageha and Edo, considering them idiots; but he admits in a later entry he does consider them friends.
Hatori Age
The animal I'm most like is a cat.
One of the three university students on the trip. A girl whose love for Uuji makes her the target of Irisu's anger.
- Abhorrent Admirer: To Uuji.
- Accidental Hero: She and Edogawa save themselves — and their friends, in a way — just by being friendly, tolerant people. They never know.
- Animal Motifs: Uuji and Irisu both liken her to a cat. Uuji because she's catty and extroverted, and Irisu because she considers her the "thieving cat" who stole Uuji away.
- Defiant to the End: She really lets Irisu have it as the latter is ambushing her. Except sometimes it isn't 'the end', and Irisu was just playing a prank. Oops.
- Doom Magnet: What are the odds that two crazed killers would want the same girl dead?
- Heel Realization: She and Edo used to say "mean things" about Uuji, but after he helped her out when she was sick, they became determined to befriend him.
- In-Series Nickname: Ageha, as in Age Hatori.
- Loving a Shadow: She knows nothing of Uuji's true nature.
- Nice Girl: She readily accepts Irisu into her circle of friends, despite her misgivings about Irisu invading Uuji's privacy.But really, though she has some strange points, she's not a bad girl.
She's always coughing and her throat seems bad, so I can't help but worry about her. - Oblivious to Love: To Edo's love, specifically, even though they've known each other for years.
- Pink Means Feminine: She has pale pink hair, appropriate to her outgoing and affectionate personality.
- Unwitting Instigator of Doom: In the bad ending, she dies without knowing why Irisu killed her.
Takeru Edogawa
One of the three university students on the trip.
- Accidental Hero: He and Ageha save themselves — and their friends, in a way — just by being friendly, tolerant people. They never know.
- The Generic Guy: He basically exists only so the other characters can play off of him.
- Heel Realization: Edo and Ageha used to say "mean things" about Uuji, but after he helped Ageha out when she was sick, they became determined to befriend him.
- Horrible Judge of Character: Makes friends with both Irisu and Uuji without realizing that both of them dislike him and think of him as an idiot.
- I Want My Beloved to Be Happy: It's implied that he has feelings for Ageha, but he's described as pushing her and Uuji together.
- Kick the Dog: He's not part of the love triangle in any way, but Irisu and Uuji want him dead anyway due to their immorality.
