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Voiced by: Hikaru Midorikawa (credited as Hikaru)
The main character. A medical student in his twenties and the sole survivor of a horrible car accident. Saved by an experimental medical treatment, he now sees the world in a contorted manner with the exception of one thing: a girl named Saya.
- Ax-Crazy: He even buys an ax later on to use for the specific purpose of hacking apart one of his former friends.
- Blue and Orange Morality: Crosses over into this if he decides to reject Saya's offer of correcting his agnosia. Having completely forsaken his humanity, he then goes on to become a straight-up Villain Protagonist whose actions now only make sense to himself and Saya.
- Cannot Spit It Out: He won't tell anyone about his agnosia, for fear of becoming a guinea pig in lab experiments. Naturally, his silence ends up doing more harm than good.
- Conveniently an Orphan: The fact that both his parents were killed in the horrific car crash means no one really knows what's going on inside his house.
- Did You Just Romance Cthulhu?: Unknowingly at first, but still.
- The Dragon: To Saya, being her main ally in her mission.
- Driven to Suicide: Attempted it before the beginning of the game due to his condition, but didn't succeed. Succeeds in 1 of the 3 endings in a particularly gory way, by smashing his face repeatedly into the blade of an ax.
- Failure Is the Only Option: He and Saya don't end up together in any of the game's 3 endings.
- Fate Worse than Death: How he viewed his abnormal condition up until Saya came into his life.
- First-Name Basis: To all of his friends.
- Good People Have Good Sex: Averted, he and Saya have a very active sex life even though they get more depraved as the story goes on.
- Harmful Healing: The brain surgery that saved his life did way more harm than good for his psyche, unfortunately. This also applies to the fact that he becomes more happy and fulfilled after crossing Moral Even Horizons for Saya.
- Horror Hunger: Due to his condition he seemingly loses his appetite for normal food which now tastes unappealing to him, no matter what dishes Saya tries to cook. However, after he returns home one day and finds Saya crouching down and eating something lying on the floor...
- Humans Are Bastards: Ruminated upon when he sees what Saya has done to Yoh:Fuminori: The horrifying cruelty of what she has done to Yoh is so very human.
- I Just Want to Be Normal: In the first of the three endings.
- I'm a Humanitarian: And his first human meal is one of his former friends, no less.
- I Will Wait for You: Again, in the first of the three endings.
- Kick the Dog: Telling Yoh that he always hated her after she tries confessing how much she cares about him. He really could have been a lot less cruel about turning her down.
- Non-Action Guy: Koji is a much better fighter than him because of this, and nearly beats him in their final duel before Saya intervenes.
- Not Good with People: In a sense. After losing his normal senses of perception, he can only relate well with Saya, who's actually an alien, and not with other people since they look like monsters to him.
- Parental Abandonment: Both his parents were killed in a horrific car crash that led him to his medical illness.
- Sanity Slippage: His insanity (or more accurately, animosity towards humanity) slowly worsens as the game progresses.
- There Are No Therapists: Averted. There are therapists available, but Fuminori refuses to see any of them because he doesn't want to become an institutionalized lab rat.
- Through the Eyes of Madness: He sees the world as if it were made of blood, flesh, and intestines.
- Took a Level in Jerkass: He is said to have been a much nicer person before the events of the game take place.
Voiced by: Naoko Takano (credited as Midori Kawamura)
A strange girl who's been living with Fuminori ever since he got out of the hospital. She's the only thing that appears normal to him.
- Achilles' Heel: She's easily dealt with by freezing, then shattering, her.
- Apocalypse Maiden: Her pregnancy marks the end of humankind.
- Artificial Intelligence: Ougai initially believes Saya to be some biological variant of this.
- Because You Were Nice to Me: In the second ending, Funimori's kindness to her inspires her to complete her mission to convert all of Earth's inhabitants into her species.
- Betty and Veronica: Veronica to Yoh's Betty.
- Big Bad: She's the story's primarily villain, with her goal being the end of humankind through turning them into Starfish Aliens, though she has nothing to do with Fuminori's condition; to him, she's nothing short of a savior.
- Bizarre Alien Sexes: It might be incorrect to even consider her a female. She only accepted being called one after reading books about human reproduction.
- Blue and Orange Morality: Saya is not conventionally evil and does not take delight in killing humans, she helps mental patients if they wish so and she only exists to fulfill a mission. Sadly, all of this still means she'll go around killing (and eating) humans both as a conventional food source and for studies, her healing skills can drive people even more insane than before and her mission is to "bloom" and release spores to convert the entire population of the planet into more beings like her.
- Brown Note: Her true form is treated like this. All of the humans that have seen it have immediately lost their sanity if they aren't outright killed by her. Only people who are already insane/disturbed seem to be unaffected, not to mention people with Fuminori's brain disorder.
- Ceiling Cling: Capable of doing this to sneak up on her prey, and she kills Omi this way.
- Combat Tentacles: Her true form has many of these.
- Cute Monster Girl: Subverted. She only appears to be cute to Fuminori, whose condition makes him see her as a cute girl. Her real appearance is never fully revealed, but it's implied to be so hideous that any normal person who sees her will be driven insane. There's also the fact that, while not conventionally evil, her behavior when not acting as a loving girlfriend to Fuminori isn't exactly cute either.
- Death by Childbirth: In the second ending.
- Does Not Like Shoes: It seems so, but the player doesn't see her feet when Fuminori talks to her, unless the CGs show more of her body. She's mostly seen in his house where she doesn't wear shoes (or socks). It's probable that she doesn't have shoes, every other character who enters in Fuminori's home doesn't see shoes of a girl. However, when Yosuke can see her as a normal girl, she's seen wearing white sandals.
- She also wears sandals on the cover.
- Don't Look at Me!: In the first ending, she visits Fuminori in the mental ward at night one day, but refuses to let him see her true form despite his desire to see her one more time. Instead, she passes him a cellphone from behind the door which they use to exchange messages with each other, until she finally bids him farewell.
- Eats Babies: Maybe. Supposedly one disappeared from the hospital while Saya was staying there, but nothing is confirmed.
- Eldritch Abomination: She's an alien from another dimension whose true form is apparently so hideous that a normal person will go insane just from seeing her. The one thing that drives her actions (aside from her genuine love for Fuminori) is her mission to convert everyone on the planet into beings like her.
- Extreme Omnisexual: Implied, given her treatment of Yoh.
- Failure Is the Only Option: She and Fuminori don't end up together in any of the game's 3 endings.
- The Fake Cutie: Looks and acts this way in front of Fuminori.
- Flower Motifs: She compares herself to a dandelion. Fitting, considering the ending where she scatters her "pollen" to infect humans worldwide.
- A Form You Are Comfortable With: Her true form is implied to be a cross between a Blob Monster and a Starfish Alien. However, the trope is played with since Saya's human form isn't one she takes on by choice; she hasn't actually changed forms at all, and Fuminori only sees her as human due to his condition.
- Good People Have Good Sex: Averted, she and Fuminori have a very active sex life even though they get more depraved as the story goes on.
- Bizarre Alien Reproduction: Later revealed to be this. Involving tentacles, to boot.
- Ms. Fanservice: In the comic adaptation, wherein she's aged up and looks like an adult. In the original game, however, she looks very young and girlish. This tends to rub some people the wrong way, and could even lead to...
- Fan Disservice: The revelation that her true form is that of an Eldritch Abomination might make their sex life even more disturbing than it already was.
- The Grotesque
- Grotesque Cute: Obviously only applies to her human form.
- Hell Is That Noise: In-universe, her true voice when it's heard by normal humans is treated this way, and sounds quite bizarre.
- Humanity Is Infectious: Ougai speculated that the reason Saya has not immediately initiated her invasion is because she developed the human concept of love after reading romance novels.
- I Do Not Drink Wine: Fuminori mentions he never saw her eat in front of him at the beginning of the game. He later finds out why.
- I'm a Humanitarian: Technically, although she only counts as one because she looks like a human in front of Fuminori while eating her favorite kind of meal.
- To Serve Man: She can eat animals as well, such as birds or cats, but prefers humans above all else.
- It Amused Me: She used to haunt the hospital Ogai worked in prior to meeting Fuminori, and spent her nights wandering the halls and scaring the crap out of insane patients (who would never be believed by anyone) for her own amusement. In fact, this was the reason she met Fuminori in the first place since she was trying to terrify him with her appearance, but when he didn't react to her with fear, she became interested in him.
- I Want My Beloved to Be Happy: In the first ending when she returns Fuminori's sight to normal again, while knowing that he can never love her the same way as he did before.
- Kill It with Ice: In the third ending, Saya gets killed with the help of liquid nitrogen after Ryoko discovers the only vulnerability in her biological makeup: below freezing temperatures.
- Leitmotif: Song of Saya I & II, two soothing but distinctly otherworldly and eerie tracks that capture everything about her character perfectly.
- Living Emotional Crutch: So very much for Fuminori. If he had never met her, he would have killed himself a long time ago. In fact, one of the three endings has him commit suicide immediately after seeing her dying body.
- Lovable Sex Maniac: Fuminori notes she is always eager to go to bed with him every day.
- Mad Scientist's Beautiful Daughter: She's not really Ogai's daughter, but she still calls him her papa. Ultimately a subversion, as she is really far from beautiful.
- Magical Girlfriend: A monstrous variation of the trope, although her love for Fuminori is still portrayed as genuine.
- Meaningful Name: Saya (鞘) is the Japanese term for a sheath.
- Nigh-Invulnerability: She's not immune to pain though. Bullets still clearly hurt her, but they won't outright kill her. Liquid nitrogen on the other hand...
- Non Human Lover Reveal: She's actually an alien from another dimension, which is made obvious to every other character who sees her except Fuminori. The only reason Fuminori sees her as human is because of his severe agnosia.
- Only One Name: Her name was given by Ogai, who named her after his beloved mother's cat.
- Power Gives You Wings: Or rather, in her case it's parturition.
- Rape as Drama: By Yosuke Suzumi.
- Rapunzel Hair: Goes all the way down her waist to her feet. She has two shorter locks of hair that stick out rather like cat ears, too.
- Rasputinian Death: In the third ending. Even after getting half her body frozen by liquid nitrogen and then blown off by a 12-gauge shotgun, she somehow manages to slowly crawl over to Fuminori's side, all while Koji is bashing her body over and over with a steel pipe, until she finally reaches him, weakly touches his face and then finally dies.
- Sanity Slippage: Subtly suffers from this after she's raped.
- Star-Crossed Lovers: With Fuminori. The only ending where they both survive is the one where he's locked up in a mental institution for the rest of his life, and she's out there somewhere still searching for her foster father, Ogai.
- Together in Death: The third ending makes this incredibly poignant.
- Super Intelligence: Her entire race has this trait.
- Super-Speed Reading: Demonstrates this ability while poring over Fuminori's medical charts.
- Unholy Matrimony: Again with Fuminori.
- Villain Protagonist: More like deuteragonist, but she fits the role of a villain.
- Violently Protective Girlfriend: In one of the endings, she kills Koji brutally and starts consuming his body immediately after breaking his neck because he was hurting Fuminori.
Voiced by: Yasunori Matsumoto (credited as Daijiro Kataoka)
Fuminori's friend. After Fuminori's accident he has been trying to help Fuminori's life get back to normal.
- Combat Pragmatist: His skill and experience in street fighting makes him a superior combatant to Fuminori, who has never fought anyone before.
- Driven to Suicide: In the third ending. He hasn't killed himself yet, but the only way he can continue living with the knowledge he now has is by keeping a revolver loaded with a single bullet in his room all the time.
- First-Name Basis: To Fuminori and Omi.
- Last-Name Basis: To Yoh.
- He Knows Too Much: Fuminori tries to kill him because of this. Luckily for Koji, Ryoko finds him before he dies inside the well he was pushed into.
- Hero Antagonist: In two out of the three game routes.
- Horrible Judge of Character: Justified in that Fuminori was his best friend, and Koji would have never guessed he would later try to kill him. Nonetheless, he still suffers a bit from this when Fuminori shows up, starts acting strange, and abruptly asks to be driven all the way to a far, remote location without suspecting he might be up to something.
- The Insomniac: Suffers from recurrent nightmares after surviving in the third ending.
- The Match Maker: He and Omi were trying to get their respective friends, Fuminori and Yoh, together as a couple before the accident happened.
- Nice Guy: He's the only genuine example of this, unlike Fuminori. (who Took a Level in Jerkass after his accident, and crossed over into Blue and Orange Morality in two of the game's three endings) At least before he gets broken down by his subsequent experiences.
- Only Sane Man: Lampshades this at one point, when he wonders why he keeps meeting crazy people all the time. This is before he loses it too, though.
- Pipe Pain: He picks up a steel pipe during his final confrontation with Fuminori at his new home.
- Red Oni, Blue Oni: Red oni to Ryoko's blue.
- Savvy Guy, Energetic Girl: With Omi, before she got killed. This only applies to their personalities though, and not their physical attributes.
- Sole Survivor: In the third ending.
- Spanner in the Works: If he hadn't called Ryoko when Fuminori wasn't looking, he would've been left to die in the well and Fuminori would've gotten away with everything with nobody to stop him.
- A Tragedy of Impulsiveness: The player can actually invoke this tropes by choosing to have Koji immediately phone Fuminori after finding the refrigerated remains of his girlfriend in Fuminori's house, rather than choosing the more rational option of contacting Ryoko first. Depending on which choice is picked, Koji will either play these tropes entirely straight or avert them.
Voiced by: Hyo-sei (credited as Elena Kaibara)
Koji's girlfriend and Yoh's best friend. She's killed by Saya when she invades in Fuminori's house. Her flesh is the first that Fuminori eats.
- Go Mad from the Revelation: Seconds before Saya envelops her, she loses her sanity.
- Killed Off for Real: The only one of the friends who is dead in every ending.
- The Match Maker: She and Koji were trying to get their respective friends, Yoh and Fuminori, together as a couple, before Fuminori's accident happened.
- Red Oni, Blue Oni: Red oni to Yoh's blue.
- Sacrificial Lamb: While Fuminori, Koji and Ryoko are alive in two endings and Saya and Yoh in one ending, Omi dies before one of the ending choices happens, meaning her fate can't be changed.
- Savvy Guy, Energetic Girl: With Koji, before she got killed.
- Stuffed into the Fridge: Literally. Her boyfriend discovers her grisly remains (including what looks like her dismembered hand) in one of the storage containers in Fuminori's refrigerator.
- Too Dumb to Live: Hearing a strange voice in Fuminori's home, yet, she still doesn't leave it.
Voiced by: Mio Yasuda (credited as Izumi Yazawa)
A young woman with an unrequited crush on Fuminori. She sincerely tries to help and understand him but her attempts to reach out to him are always met with disdain. She dies in 2 of the game's 3 endings.
- Betty and Veronica: Betty to Saya's Veronica.
- Body Horror/Viral Transformation: Happens while she is slowly and painfully getting transformed into the same being as Saya. When Koji phones her, she says that her ear is melting off, and her fingers aren't supposed to look like that...
- Butt-Monkey: Played for drama. Horrible things happen to her.
- Buxom Is Better: Fuminori is more aroused by her voluptuous physique than by Saya's more childlike body.
- Break the Cutie: First by Fuminori brutally rejecting her, then by Omi's disappearance, before things take a turn for horrible in the routes for the second and third endings, culminating in Kill the Cutie in both.
- Cruel and Unusual Death: Koji is turned mad at the sight of her monster form and so beats her to death with a steel pipe.
- Empty Shell: After being turned into the same being as Saya, her mind is shattered and is faced with constant severe pain, leaving her with almost no trace of her personality nor intelligence. She regains more coherence when begging Koji to kill her.
- Fate Worse than Death: Fortunately, she dies in both endings this happens to her.
- I Cannot Self-Terminate: She begs Koji to kill her at the end of the game because she is suffering so much in her new form.
- Meaningful Name: The kanji given for "Yoh" means "beautiful". Yoh is consistently described as beautiful or pretty, and both Saya and Fuminori view her as such.
- Rape as Drama: First by Saya, then by Fuminori, then both at the same time...
- There Is No Kill Like Overkill: First she gets shot four times, and then she gets beaten to a bloody pulp by Koji's steel pipe when he freaks out after seeing her transformed state. The text states that she stopped moving after the twentieth time he used the pipe, but he keeps going all the way past thirty.
- Too Dumb to Live: She knows that the one who is sending her messages on her mobile phone is not Omi, but she still goes into Fuminori's house. Even when she hears the strange noises and is horrified, she wants to believe it's just her friend trying to prank her. Saya doesn't kill her, but Yoh's transformation into an Eldritch Abomination ultimately leads her to her death by Koji.
- Unrequited Tragic Maiden: Things really don't end well for her in two of the endings simply because she had an unrequited crush on Fuminori.
- You Gotta Have Blue Hair: Has purple hair in the scenes where she's being raped by Fuminori and Saya and a later scene where she's pleasuring Fuminori during a phone call. It's possibly a side-effect of Saya transforming her and with said scenes being viewed in Fuminori's warped perspective, except that the scene where Fuminori first sees her in the fetal position (which happens both post-transformation and in Fuminori's perspective) gives her brown hair. Yoh also appears to have purple hair in the shot after she tries calling Omi's phone; while the colouring could be somewhat explained by the lighting, there is definitely a purple hue to it if you look closely.
Voiced by: Mitsuki Saiga (credited as Makoto Sato)
Fuminori's doctor. A friendly professional who wants to help Fuminori as best as she can. Her real personality is actually very distant and calculated. She also knows a lot more about Fuminori's condition and treatment than she lets on. She dies in 1 of the game's 3 endings.
- Beneath the Mask: On the job, she's a kind, friendly doctor, albeit somewhat cold and extremely secretive. Off the job, she's paranoid and obsessed with killing the Eldritch Abomination that haunts her dreams.
- Dying Moment of Awesome: Despite getting an axe cutting down through her left shoulder to her chest, she manages to point her 12-gauge shotgun at Saya, who has been partially frozen by liquid nitrogen, and pull the trigger in her final moments, all while smiling horribly.
- Go Mad from the Revelation: Discovering Ogai's research really pushed her over the edge.
- Go Out with a Smile: Definitely not the peaceful kind, though.
- Ice Queen: Always has a ruthlessly cold demeanor, even when she's behaving at her politest to her patients.
- The Insomniac: Suffers nightmares daily after finding about Ogai's research experiments.
- Meganekko: Subverted when she reveals her true personality, though.
- Normally, I Would Be Dead Now: Her dying moment of awesome is all about this.
- Psychotic Smirk: Flashes these several times to show her breaking sanity, but most triumphantly when she pulls the trigger of her shotgun in her final moments to finish off Saya while sneering at Fuminori.
- Sawed-Off Shotgun: Carries one around with her all the time. She deliberately modified hers to widen its range and for maximum damage.
- You Gotta Have Blue Hair: Has green hair that can look teal- or blue-coloured depending on the lighting.
Masahiko OgaiDoctor Masahiko Ogai is the foster father of Saya and he worked in Dr. Tanbo's hospital, until he suddenly disappeared. He's involved in several mysteries and Fuminori helps Saya to find him and he investigates him. Ogai studied Saya and taught her various things, such as communication and maths. He commited suicide, and his skeleton is found by Doctor Tanbo and Koji if the player doesn't play the first ending.
- Driven to Suicide: He killed himself with a gun, when the police investigated his case.
- The Ghost: He never makes an appearance during the story and the characters only talk about him, until his corpse is found.
- Mad Scientist: He even wished that Saya would find her love and could reproduce her race, even if it would exterminate the human race.
- He is the only one who didn't go mad at the sight of Saya and liked the mutated rats she created.
- Predecessor Villain: He kept Saya in his home where she developed her personality.
Voiced by: (credited as) Masayuki OnizawaFuminori's neighbor and an artist who lives with his wife and little daughter Hiromi next to the Sakisaka house. Saya messes with his brain, giving him the same vision problem as Fuminori. Believing that his wife and daughter are aliens, he kills them and then he rapes Saya, believing she's the only girl in the world. He's killed by Fuminori during his rape.
- All Men Are Rapists: Believing that Saya is the only girl in the world, he rapes her.
- Asshole Victim: You cannot feel sympathy for him when he's raping Saya.
- Ax-Crazy: After seeing an Eldritch Abomination that is actually his wife, he kills everything that looks alien.
- Dirty Old Man: He rapes Saya because she is the only girl he can see in the world.
- Dramatic Irony: He doesn't recognize his wife and daughter after the surgery and kills them.
- Eye Scream: Fuminori stabs his eye first before he's killed.
- Fan Disservice: Raping Saya isn't nice to watch, but later when Fuminori's see this act, he believes that Yosuke is a purple Eldritch Abomination with its penis in her. Squick.
- Go Mad from the Revelation: After Saya changes his brain.
- Knife Nut: He uses a knife to protect himself. And he gets nuts.
- Megane: He wears glasses.
- Neat Freak: The game goes into great detail about his daily routine and how obsessive he is over keeping his house clean.
- Nice Guy: Played with. He offers his help cleaning Fuminori's garden since it's stinking, but Fuminori guesses that he pretends to be nice and Fuminori's garden disturbs Yosuke's perfect image of his house. However, Yosuke talks with his wife about Fuminori's current situation and they seem to be concerned about him. Then Yosuke goes insane and he loses his nice attitude anyway.
- Pater Familicide: The results of Saya's brain surgery and going insane.
- Stuffed into the Fridge: Like Omi, he and his family are dismembered and put in a refridgerator.