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Kyoya SudaThe main character, more or less. An Ordinary High-School Student who comes to the Hanuda area to investigate an urban legend about a mysterious village and a massacre that supposedly took place there. He finds himself stranded in the mountains after his bike breaks down, stumbles upon a weird religious ceremony, and then gets shot by a cop who's apparently immune to getting run over by a truck. And that's just the beginning.
- Clothing Damage: He gets a bullethole in his shirt after being shot once in the prologue, and another one later after being shot again.
- Failure Hero: He is unable to prevent Miyako's death from the ceremony.
- Fragile Speedster: He isn't very resistant to damage. To compensate, he is one of the fastest characters.
- Hide Your Children: His age was raised from 16 to 18 for the American release.
- Innocently Insensitive: Doesn't have a lot of tact and tends to be brutally honest at times.
- Took a Level in Badass: The blood transfusion he receives from Miyako grants him immunity to becoming a Shibito at the cost of never leaving the underworld. Also, upon being shot a second time and getting separated from Miyako, he ventures the Shibito Nest with Yoriko in search for her.
- Walking the Earth: It's implied that this is what he's been doing between the first and second games. Not much else he can do, being stuck in another dimension and all.
Tamon TakeuchiA professor of folklore at the Josei University in Tokyo, but born and raised in Hanuda. Tamon travels to the area under the guise of researching local folklore, but is actually trying to uncover the truth about a landslide that killed his parents in the seventies in the very same village.
- Badass Bookworm: He is a university professor who dons a cool revolver like nobody's business. He also comes with a .38 revolver and is not afraid to use it.
- The Lancer: To Kyoya to an extent, particularly when they briefly team up in day 3.
- Lightning Bruiser: Arguably the most durable and fastest character and comes equipped with a gun and later a melee weapon. Ironically, he has the slowest Instant 180-Degree Turn.
- Jerkass: He can be rather harsh with Yoriko.
- Jerk with a Heart of Gold: Despite his behavior, he's trying to protect Yoriko.
- Parental Abandonment: His parents were buried under a landslide when he was just a child.
- Revolvers Are Just Better: Except for his last mission, he always carries a revolver.
Yoriko AnnoA somewhat geeky and ditzy (at first) student of Tamon's who invites herself along on his trip to Hanuda. She secretly harbors a massive crush on him.
- Hot for Teacher: Not only is she fond of her tutor, she keeps a photo of him in her wallet, and gets embarrassed if she suspects anyone trying to take a look inside.
- The Load: For Tamon during his levels, as well as Akira's and Kyoya's, when he is separated from Miyako. Granted, she gets better.
- Rescued from the Scrappy Heap: Comes across as a bit of a whiny Load early on in the game, but gets much more useful and likable later on.
- Thinks Like a Romance Novel: A big fan of Ouke no Monshou and others, she thinks of being taken to the Other World as an adventure with her as the Plucky Girl heroine. All things considered, it works out pretty well for her—she may be trapped in the Other World, but Siren Maniacs mentions that she's probably taking it as an opportunity to explore and have strange experiences.
- Too Dumb to Live: Early on, when Tamon leaves her alone and tells her to stay put, she decides to go searching for something she dropped in a completely different area without any means of defending herself.
- Took a Level in Badass: By the end of the game, her and Tamon's roles appear to be reversed, as she's the one taking charge and dragging his helpless ass along.
Kei Makino (né Takaaki Yoshimura)Also referred to as "Leader Makino" because of his position as a priest for the local Mana religion. He is the identical twin brother of Shiro Miyata.
- Actual Pacifist: Refuses to use a weapon at all, even if it means having to fend off a Shibito to save someone's life. Near the end of the game, 'Kei' finally mans up and takes Tamon's .38 revolver to defend himself.
- Aloof Older Brother: Zig-zagged. He is the older twin and has more respect in the community than Shiro, but Shiro is the stronger, more capable individual who is cold and distant towards Kei...who feels inferior to Kei.
- Always Identical Twins: With Shiro.
- Always Someone Better: Shiro sees him as this due to his position in the community.
- Cain and Abel: The Abel to Shiro's Cain. A very one-sided example; Kei is unaware of Shiro's jealousy towards him and one of his first instincts when Hanuda mixes into the underworld is to look for Shiro; Shiro never bothered to try and find out whether Kei was safe or not.
- The Chick: A male example, and one of the more prominent opposing traits to his brother.
- Dark Is Not Evil: His black priest's robes contrast with his brother's white doctor's coat, but Kei is a kind, moral, if inefficient person, in contrast to the unstable and homicidal Shiro.
- Failure Hero: He is unable to protect Tomoko as he tries to escort her to safety, and could not protect Risa from Mina, twice. This indirectly causes Tomoko's and Risa's transformations into a shibito.
- Family Relationship Switcheroo: Kei was adopted by Reiji Makino (older brother of Ryoko Miyata, Shiro's adoptive mother) and he and Shiro were raised as cousins. However, Shiro and Kei figured out their true relationship early on in life, and their twinship seems to be an open secret among Hanuda's residents.
- Freudian Excuse: Lived a cosseted life as the heir to the Makino family, a life which also left him embracing Hisako Yao as a mother figure—and utterly dependent on her guidance. When she fully awakens and abandons him, he's completely rudderless.
- Good Shepherd
- Happily Adopted: His adoption by Reiji Makino in contrast to Shiro's adoption by Ryoko Miyata (Reiji's younger sister). However, Reiji loses points for committing suicide when Kei is 12, leaving Kei to replace him as guiding priest, but not preparing Kei for his duties.
- Identical Twin ID Tag: His hair is parted in the middle and still has its natural black color, while Shiro brushes it forward and dyes it brown. He also has a beauty mark on the left side of his face, above his lip, which Shiro lacks.
- Nice Guy
- Non-Action Guy
- Parental Abandonment: His birth parents died in a landslide when he was an infant, and his adoptive father committed suicide when he was 12.
- Separated at Birth: An odd example with Shiro. He and Shiro were separated as infants after the death of their birth parents. Unlike most examples of the trope, they were raised in the same isolated village and their respective adoptive parents were brother and sister, so even though they weren't raised as brothers, they still had some presence in each other's lives and figured out their true relationship by themselves early on. Unfortunately, the warm Kei and the cold Shiro find it too difficult to get along and do not develop a healthy brotherly relationship. They remain so distant from one another that by the time Siren takes place and they are 27, they still refer to each other by their respective adopted last names.
- Sibling Yin-Yang: The kind-hearted, yet passive counterpart to the cold but effectual Shiro.
- Took a Level in Badass: Subverted. In his final two missions, he is suddenly no longer afraid to fight shibito, but the "Kei" that appears in these final two missions is in fact Kei's already badass twin Shiro, impersonating Kei after killing him.
- Twin Switch: If you want to get technical, it's not much of a ''switch" per se, as he gets killed in the process...
- Twin Telepathy: A mild version with Shiro. They often cross paths even though they try to avoid each other and they share a recurring dream about the previous Miyako.
Shiro Miyata (né Katsuaki Yoshimura)A handsome young doctor at the local clinic and Kei's identical twin brother. He's dating Mina Onda, the nurse who has gone mysteriously missing at the start of the game.
- Abusive Parents: His adoptive father was emotionally neglectful and refused to be a father to him, while while his adoptive mother would compare him unfavourably to Kei and pressure him to become a successful doctor in order to surpass Kei, telling him that if he did not, he would be "discarded" by the family. To this end, she did not allow him to play with toys or other children and made him spend all his free time studying.
- Aloof Older Brother: Zig-zagged. He is the younger twin, is far more capable than Kei whom he is cold and distant towards, yet he is the one who feels inferior towards his brother, instead of the other way around.
- Always Identical Twins: With Kei.
- Always Someone Better: He sees his brother as this due to the respect he has in the community as a religious leader.
- Badass Labcoat
- Cain and Abel: The Cain to Kei's Abel. Despite his success in his own field, Shiro's somewhat jealous of his brother's position in the community. He eventually winds up killing him and masquerading as him.
- Dead Person Impersonation: Ultimately, he ends up killing Kei and posing as him. A somewhat interesting example because by the time he does this, there is nobody around for Shiro to interact with to treat him as Kei and he intends to kill himself very soon; he just wants to "be" Kei instead of himself that badly.
- Dr. Jerk: Zig-zagged. He is never shown performing his duties as a doctor so we don't know anything about his bedside manner, and he isn't a jerk in terms of personality and temperament... but he commits several horrible actions over the course of the story.
- Driven to Suicide: After confronting his twin Kei for the final time, he puts a gun to his head, though it's ambiguous whether he did this to drop his brother's guard down to kill him, or Kei intervened and ended up shot dead by accident.
- Drop the Hammer: His main weapon is a claw hammer.
- Even Evil Has Standards: Cold-hearted as he is, even he is horrified by the fate of the half-Shibito who have been Buried Alive for decades and willingly sacrifices his life by using the Uryen to Mercy Kill them.
- Evil All Along: He appears to be a man simply looking for his missing girlfriend, but it turns out he murdered her before the start of the game.
- Evil Brunette Twin: Inverted. He dyes his naturally black hair brown, but his good twin keeps the naturally darker shade.
- Family Relationship Switcheroo: Shiro was adopted by Ryoko Miyata (younger sister of Reiji Makino, Kei's adoptive father) and he and Kei were raised as cousins. However, Shiro and Kei figured out their true relationship early on in life, and their twinship seems to be an open secret among Hanuda's residents.
- Freudian Excuse: His adoptive mother was mentally unstable, while his adoptive father was emotionally neglectful and indifferent towards him. This leads to Shiro himself growing up to become mentally unstable and emotionally cold towards others.
- Heel–Face Turn: What he settles on, but it is more due to being compelled by the spirit of the previous Miyako, than any epiphany/change of heart on his own part.
- Hidden Depths: His mental instability is not readily apparent.
- Identical Twin ID Tag: His hair is brushed forward and dyed brown, as opposed to Kei who parts it in the middle and keeps its natural black color.
- Kick the Dog: His murders of the Onda sisters and his brother.
- Light Is Not Good: His white doctor's coat contrasts with his brother's black priest's robes, but Shiro is the Evil Twin, not Kei.
- Mad Scientist: Shiro seems a little too happy in cutting up the Onda sisters.
- Parental Abandonment: His birth parents died in a landslide when he was an infant and his adoptive parents passed away at some point. We know his mother had some sort of illness, but it is not said how his father died.
- Replacement Goldfish: Was adopted by Ryoko Miyata for this purpose; she lost her infant son Shiro in the same landslide that killed his birth parents.
- Pet the Dog: Maybe. It's open to interpretation, but he seems genuinely concerned with keeping Risa safe...before he goes crazy and strangles her to death when she impersonates Mina.
- Separated at Birth: An odd example with Kei. He and Kei were separated as infants after the death of their birth parents. Unlike most examples of the trope, they were raised in the same isolated village and their respective adoptive parents were brother and sister, so even though they weren't raised as brothers, they still had some presence in each other's lives and figured out their true relationship by themselves early on. Unfortunately, the warm Kei and the cold Shiro find it too difficult to get along and do not develop a healthy brotherly relationship. They remain so distant from one another that by the time Siren takes place and they are 27, they still refer to each other by their respective adopted last names.
- Sibling Yin-Yang: The cold and competent opposite to his kind and ineffectual brother.
- Twin Telepathy: A mild version with Kei. They often cross paths even though they try to avoid each other and they share a recurring dream about the previous Miyako.
- Weaker Twin Saves the Day: Inverted. Shiro is without a doubt the stronger twin in terms of having courage and drive that Kei lacks. However, since Kei is the village's guiding priest, he is the one that has important duties and expectations thrust upon him. Unfortunately, Kei is too incompetent to carry out these duties, and cannot handle the pressure placed on him. However, Shiro can handle these duties and keep a cool head, so what does Shiro do? He murders Kei and assumes his identity so he can fulfill the duties of the guiding priest.
- Wild Card: Good luck trying to guess his next move and motivations. His senseless murder of Kei in particular comes out of nowhere.
Akira ShimuraA 70-year-old hunter who has lived his entire life in Hanuda. He goes around shooting shibito and dropping cryptic hints about what is going on.
- Ate His Gun: His fate. When he realises that there's no way out of the alternate dimension, he turns his hunting rifle on himself. Sadly, it doesn't have any effect outside of blowing his brains out, as he soon wakes up as a shibito.
- Cold Sniper: He doesn't particulary care about meeting survivors and prefers his own company but he is still willing to save lives if the opportunity comes along.
- Cool Old Guy: Akira is 70 years old, but he is pretty spry for his age and a great shot who enjoys going on occasional hunting trips, and he is more than capable of standing up to the shibitos who gets in his way.
- Driven to Suicide: He tries to kill himself in an attempt to escape the curse. It doesn't work.
- Glass Cannon: He is an expert at sniping and is never seen without his rifle, but because of his age, he is slow and has terrible endurance.
- Properly Paranoid: Part of his backstory. In the weeks before the plot kicked off, Akira was quite aware that something very strange was going on in Hanuda, noticing on his hunting trips that the forest around the town was unusually quiet and the animals seemed strangely nervous and on edge, and he also saw frequent evidence of an increase in the local cult's activities and was convinced that they were about to do something terrible. He, of course, was completely right. As he ruminates on all of this on the day before the cult sets the ritual in motion, Akira laments that he feels pretty powerless to stop or even call attention to whatever it is the cult is doing, as he fears people would just dismiss him as a crazy, rambling old man if he was to try telling anyone about it.
- Survivor Guilt: Part of his backstory. He once had a wife and a son, but he lost them both during the 1976 earthquake. Ever since, Akira has deeply regretted that he Never Got to Say Goodbye and he sometimes wishes he had died with them back then so they could be Together in Death.
Hisako YaoAlso known as "Guide Hisako", being a high-ranking member of the enigmatic Mana Cult. She encounters Kyoya early on in the game and helps him gets his bearings in the tutorial stage.
- Amnesiac Dissonance: Has lived for so long that she's forgotten her task, which is why she helps Kyoya early on before remembering what she was supposed to be doing.
- Locked into Strangeness: Upon her witnessing the death of her god, her hair turns white at the shock.
- Nice Girl: Cares for a scared and confused Kyoya in the beginning, and is concerned with the disappearance of Tomoko and sets off to help find her. Then she recovers from her amnesia and drops her nice demeanour altogether.
- Really 700 Years Old: Thousands of years old, actually.
Miyako KajiroA 14-year-old girl born with a sixth sense but without eyesight, Miyako is supposed to be sacrificed in the Mana cult's ritual but is on the run from her fate. She meets and tags along with Kyoya, and the two form a close bond over the course of the story.
- Blind Seer: She has born with the ability to sightjack, and is able to use it even outside the Other World, allowing her to compensate for her blindness by using her trusty dog as a literal eye-seeing dog.
- Kill the Cutie: She is killed upon her capture and her forceful participation in the ceremony created by Hisako Yao and the Kajiro siblings.
- Mystical Waif: Miyako is very much a archetypical example. She is a young girl Kyoya meets quite early on and he feels driven to protect and help her. Miyako, on the other hand, is deeply important for the cult's ritual, and she is implied to possess some form of Psychic Powers, having been able to sightjack her entire life even without entering the Other World.
- The Load: She is arguably even moreso than Yoriko. Since she's blind, you have to stay close to her and occasionally turn back and look at her so she is able to follow you.
Reiko TakatoA teacher at the Hanuda elementary school, who cares for her young pupil Harumi as if she was her own daughter.
- Badass Teacher: The fact that she is willing to protect her pupil Harumi at all costs definitely earns her this title. Her title is well-earned when considering her backstory, as explained in an archive file. During a summer break, disaster struck in a beach, resulting in a number of students drowning or vanishing. Reiko was able to save the lives of two other students during the incident, but tragically her own daughter was not found until it was too late.
- Heroic Sacrifice: When trying to hide Harumi in a cart used by the shibito, the siren sounds and the shibito is alerted to Harumi's presence. With no other options, Reiko decides to sound the horn from an abandoned truck, leak the gasoline, and ignite it. The resulting explosion not only disables the shibito, but it also kills Reiko.
- Lightning Bruiser: The strongest female character and has the fastest Instant 180-Degree Turn. Her downside that is her melee weapon, though powerful, is slow and difficult to use.
- Mama Bear: Toward Harumi. Even after being shibitofied.
- Tragic Monster: As a shibito, she wanders in search for Harumi or her late daughter Megumi, crying to herself along the way.
- The Woobie: Though not apparent at first, Reiko sees Harumi as a daughter to cope with the loss of her own daughter, Megumi, after a freak summer break accident.
Harumi YomodaA 10-year-old elementary school student, whom Mrs. Takato has taken under her wing.
- Infant Immortality: Unlike the other characters, she is never shown dying when a shibito catches up with her, merely cowering instead as the screen fades out. She's also the only character who makes it out of the otherworld alive.
- One Hitpoint Wonder: One of the main contributors to the school stage's infamous status as the Scrappy Level.
- Only Friend: A part of her backstory. She is quite good friends with Miyako, and is the only person from Hanuda who is known to have befriended her.
- Orphan's Ordeal: She lost both her parents to a freak accident. It has very much marked her.
- Replacement Goldfish: For Reiko's daughter.
- Sole Survivor: Is the only confirmed character to escape the cursed village and survive with her life.
- The Woobie: Listen to her as she loses her beloved teacher when she witnesses the aftermath of Reiko's Heroic Sacrifice, and again when said teacher returns, but as a Shibito.
Risa OndaMina Onda's identical twin, who was born in Hanuda but has since then moved to Tokyo. She's come home to visit her sister, only to get caught up in the horrible wackiness that's going on.
- Creepy Twins: With Mina, though only after they've both been shibitofied.
- Damsel in Distress: Tends to fall into this at times.
- Kill the Cutie: After being linked by her shibito twin sister and used to provoke Mina's killer Shiro, Shiro strangles Risa with his bare hands. Seconds later, bloody tears fall from her eyes, and she starts laughing...
- Laughing Mad: Shortly after being killed and returning as a shibito.
- Twin Telepathy: There is definitely a connection between her and Mina. It's implied that the reason Risa turns into a shibito is because her sister is infected as well.
Mina OndaRisa's sister, Shiro's lover, and a nurse at the Miyata clinic. She appears to have gone missing at the start of the game.
- Advancing Boss of Doom: Is this in Risa's second level. Weapons doesn't make her flinch, and getting too close prompts Mina to strangle Risa to death, no matter how many times Risa tries to shake her off. The only option is to run.
- Anti-Villain: Despite being a shibito, her only goals seem to be reuniting with her sister and getting revenge on Miyata for murdering her. Notably, she simply knocks out Shiro's twin Kei even though she has an easy opportunity to kill him.
- Expy: To Pyramid Head
- Creepy Twins: With Risa, though only after they've both been shibitofied.
- Implacable Woman: Being one the earliest characters to become a shibito, she grows strong over time to the point where gunshots doesn't even faze her.
- Posthumous Character: She is dead before the start of the game, killed by Shiro. She doesn't stay dead for long...
- Twin Telepathy: There is definitely a connection between her and Risa.
Naoko MihamaA former model and actress who hasn't been able to keep up with the competitive entertainment industry and has been reduced to B-list status. She's in Hanuda to film an episode for an occult TV series of questionable quality when she gets separated from her camera crew.
- Driven to Suicide: She drowns herself in a pool of red water, having been driven mad by the events of the game.
- It's All About Me: She cares about her looks, her biggest flaw aside from being a rude bitch. When she misinterprets Akira's talk of the red water, this alongside Sanity Slippage and/or Driven to Suicide cause her to walk into a pool of the stuff.
- Irony: She voluntary chooses to become a shibito in the hopes she will get to stay young and pretty forever once she is one. Shortly after being shibito-fied, however, she starts mutating, and just so happens to transform into the rather grotesque crawler form, which was probably not was she was hoping for when she chose to convert herself.
- Jack-of-All-Stats: She is average in health, speed, and picks up a small firearm to use.
- Madness Mantra:
- "Eternal youth. Eternal youth. Eternal youth..."
- Later, she is constantly heard saying things like "Won't you look at me?" and "Tell me I'm beautiful!" following her transformation into a shibito.
- Ms. Fanservice: A few racy pictures of her can be found throughout the game as archive items.
- Precision F-Strike: (as the fact that she's been separated from her crew sinks in) "Shit."
- Rich Bitch: Subverted. She's not actually rich, but she sure acts like she is.
Tomoko MaedaA young girl who had just run away from home when the whole of Hanuda went to hell. Now she's trying to reunite with her parents.
- Hide Your Children: Her age was raised from 14 to 16 in the US version.
- Tomato in the Mirror: During her final stage, none of the shibito attack her. At the end of the mission, you find out it's because she's already turning into one of them.
- Tragic Monster: She isn't aware of her own transformation into a shibito, and falls into despair after her terrified parents' rejection, though they are truly reunited once her parents become shibito themselves.
- The Woobie: She spends most of her story arc separated from her parents, and returns to them unknowingly as a Shibito, and is quickly rejected by her traumatised and terrified parents. Tomoko turns away, heartbroken, although the family is able to live together in the end, as shibito, so it thankfully gets better. Just not for Harumi.
DatatsushiThe Big Bad that Hisako has been trying to resurrect. He was an extra-dimensional being whose ship crash-landed on Earth in 683 AD, specifically in Japan during a great famine, and was eaten when the people of Hamura saw him as food that was a gift from the gods.
- Ancient Astronauts: An accidental visitor. His ship crash-landed on Earth, setting the game's events in motion.
- Crucified Hero Shot: When he was being eaten, he was laid out on two planks of wood. Since he's seen as a god (or rather, God in general) by the Mana religion and Hisako, this actually fits in with his faux-deity identity.
- Fish People: It looks just like a weedy sea dragon with six extra sets of humanoid arms. Its name is even a bit of wordplay; it means "fallen dragon child" in loose Japanese. The Japanese name for seahorse also means "dragon's child".
- Humans Are Bastards: What with his experience with Hamura's people before dying, it's justified.
- Our Mermaids Are Different: It is a hybrid between a seahorse and a human, and a common Japanese folktale states that consuming mermaid flesh makes one immortal.
- Tragic Villain: Imagine it; you've just made a violent landing on an alien world, and then get swiftly eaten by its habitants. The sympathy can be laid out moreso when at the time, his body was in a small, larval form.
- The Voiceless: Because of this, we don't know how he feels about being resurrected, or even if he wanted to be, let alone how he feels about Hisako giving him strength in the final battle. Given how he crash-landed, got his flesh eaten, and just going berserk with ripping the Nest apart, he's likely to be very angry with humanity.
Mamoru ItsukiA young journalist who arrives on Yamijima Island to gather material for an article for the mystery/science magazine "Atlantis". Can be considered the main character of the game.
- The Atoner: Becomes this after being tricked into releasing Mother and the Yamibito.
- Literal-Minded: He doesn't really display this a lot, but the only time it's made very clear is when Ikuko jokes about swimming to Yamijima. He actually does calculations over the likelihood.
- Nerd Glasses: He always wears them, which goes with his logical thinking. He loses them upon escaping from the Underworld he accidentally released.
- Nice Job Breaking It, Hero!: He unintentionally releases the Yamibito from the Underworld to the surface. With the help of Ikuko, he quickly seals the Underworld before too many gets out.
- Not So Stoic: Upon finding out that he was used by Yuri Kishida to release Mother and had accidentally aided them in unleashing the Yamibito on the island. Witnessing their handiwork on an abandoned ferry, for a mere moment he loses it and becomes determined to kill each and every one of them.
- The Stoic: He take a lot of the disturbing events in Yamijimi Island with stride and rarely loses his cool.
- Took a Level in Badass: He starts off as a simple journalist trapped on an island, and develops into one of the few people who manages to slay an Eldritch Abomination bent on destroying humanity.
- Unwitting Pawn: He realizes too late that he is being used by Yuri Kishida to free her 'mother' from the Underworld, thus sending a new wave of enemies upon the island. He then spends the rest of the game trying to fix his mistake.
- What An Idiot: Really? The whole "this enormous scale is from my mother" thing didn't tip you off at all that there might be something weird about Yuri? To be fair, it's possible she has some sort of clamouring powers.
Yuri KishidaA mysterious, beautiful, yet vaguely unsettling young woman whom Mamoru stumbles upon at the beginning of the game. She claims to be on the island looking for her mother.
- Advertised Extra: Recieves prominent focus in the trailers, but has no role beyond using Mamoru to open the entrance to the Underworld and merging herself with Mother, who then sends her offspring to raise havoc on the island.
- Body Horror: After luring Mamoru down to the Underworld, she opens her shirt... to reveal that she has no breasts. Instead, a giant face appears on her chest and stomach. A 'smiling' giant face, more specifically. Enjoy the Nightmare Fuel as it sinks in.
- The Dragon: Is the only off-spring of Mother to willingly and successfully carry out her plan to enter the real world and terrorize humanity.
- Humanoid Abomination: Is eventually revealed to be an offspring of Mother, a gigantic and ancient mermaid creature.
Shu MikamiA popular romance novelist whose sight has been impaired by a traumatic childhood event. Born and raised on Yamijima island, he is returning home in order to recover his lost memories. In-game, he is able to navigate around by sightjacking his seeing-eye dog Tsukasa.
- Canine Companion: Tsukasa, his seeing eye dog. She gets transported to Soji later on.
- Decoy Protagonist: From the beginning, the game makes it look like he's the main character. He dies at the end of the first half of the game.
- Spirit Advisor: Becomes this to other characters once he is absorbed by Mother.
Ikuko KifuneA teenaged girl who works on the docks and on the boat when it gets whisked away by the red tsunami. She has the ability to take control of the beings she sightjacks.
- All of the Other Reindeer: She's shown being bullied because of her psychic powers.
- Cast from Hit Points: Controlling a shibito exhausts Ikuko.
- Tsundere: Behaves like this towards Mamoru early on, softening up once she learns to trust him more.
Takeaki MisawaA major in the Japanese Ground Self-Defense Force who crash-lands on the island in a helicopter along with Yorito Nagai. He is determined and experienced, but is constantly haunted by visions of a rescue operation he took part in years ago.
Yorito NagaiA private in the Japanese Ground Self-Defense Force who crash-lands on the island in a helicopter along with Takeaki Misawa. Young and inexperienced, Yorito can't help but follow Misawa's lead until the circumstances force him to man up and take charge of himself.
- Bottomless Magazines: The assault rifle he uses in his final mission against Otoshigo, which came out of absolutely nowhere with no buildup or explanation.
- A Fate Worse Than Death: When the tangent dimension collapses, Yorito is unlucky enough to get thrown to a dimension full of yamibito.Or maybe he just snapped.
- The Lancer: To Mamoru when they team up near the end.
Soji AbeThe flatmate of a murdered young woman called Ryuko Tagawa who is accused of killing her. He kidnaps clairvoyant Akiko Kiyota and persuades her to help him clear his name. His special ability in-game is setting down hunting traps, which immobilize the enemy and makes them take more damage.
- Face of a Thug: Looks like your average delinquent, but is actually a rather friendly individual, if a little hot-tempered.
Akiko KiyotaThe clairvoyant who accompanies Soji to Yamijima Island, where she believes they'll be able to find some answers on what really happened to Ryuko. She can use her sightjacking skills to see flashbacks of past events.
- Grand Theft Me: Her body gets hijacked by Kanae once she gets too absorbed in solving the mysteries of the past, leaving herself vulnerable to possession.
- Psychic Powers : Possesses Clairvoyance with a side of Retrocognition.
Shigeru FujitaAn aging, unlucky police officer investigating rumors of activity on Yamijima Island. After he dies, he returns as a 'mini-boss' Yamibito.
- Butt-Monkey: He got a job demotion and his family distanced themselves from him due to his job dedication. And then he went to Yamijima...
- Doomed Home Town: He was born on Yamijima Island, but left before the population vanished.
- No Good Deed Goes Unpunished: After saving Ichiko, she thanks him by killing him.
Ichiko YaguraA 14-year-old schoolgirl who finds herself wandering in the stranded Bright Win ferry with gaping holes in her memory.
- Bottomless Magazines: With a submachine gun she randomly pulls out when she's possessed by Otoshigo.
- The Woobie: She wakes up on a ferry with the undead after her. And then it turns out she died, got possessed, then felt guilty to the point of tears when she realises she killed Shigeru when Otoshigo possessed her to do so.
KanaeA mysterious young woman from Shu's past.
- Burn the Witch!: The people of Yamijima island are utterly convinced that she is the harbinger of doom. They were right.
- Mook–Face Turn: Her attachment to young Shu and her shame for killing his father enables her to escort him out of Yamijima island, away from the mob. Later on, whilst possessing Akiko Kiyota, she helps Mamoru and Ikuko in their battle with Mother and delivers the first blow at the cost of her life.
- My God, What Have I Done?: Upon murdering Shu's father under the order of Mother, she soon becomes overwhelmed with guilt, rebels from Mother, and helps young Shu escape from Yamijima island.
- Suspiciously Similar Substitute: In-universe example. Kanae was created to resemble Shu's dead mother and manipulate him into releasing Mother. His father finds her resemblance rather suspicious.
Tsuneo OhtaThe chief of Yamijima island, who suspects that Kanae has brought a curse upon his home, and rallies a mob to execute her.
- Kick the Dog: Not only he brings a mob to hunt down Kanae, he and the villagers also targets a scared four-year-old Shu just because he is with her.
Tomoe OhtaTsuneo's daughter, who helps her father to find the 'witch' that laid a curse upon Yamijima island.
- Impaled with Extreme Prejudice: She dies by falling off a bridge and is skewered by a sharp antenna of a roof.
- Mini-Boss: She becomes this as a dog yamibito as the focus of two mission objectives.
- Vanity: As a dog yamibito, she wants to find her nice hair comb. However, it could be due to the fact that it's a precious gift from her father.
MotherOne of the two Big Bads of the game. After God created light, the remaining darkness split off into two beings; Mother and Otoshigo. Mother was locked up in a cave, while Otoshigo searched for her in the sea floor ever since.
- Big Bad Ensemble: Although she is one of two, Mother is more prominent, as Otoshigo has very little screentime.
- Eldritch Abomination: Obviously. Given how she's one of the products of darkness itself, she's not exactly normal compared to humanity. Her appearance is...unsettling, to say the least, though we don't know if what we see is anything resembling her true form. From what's seen, her form after using her avatar Yuri as a base for it, resembles a young woman with a very elongated neck and arms, with the bottom of her body being the same as the traditional image of a mermaid, only more fleshy.
OtoshigoThe second Big Bad. He's been searching for Mother for many years, desperately wanting to kill her.
- Big Bad Ensemble: Alongside Mother, though he is featured less prominently, he still remains an equal threat.
- Eldritch Abomination: He and Mother literally follow the 'two peas from the same pod' metaphor (just replace "peas" and "pod" with "Eldritch Abomination" and "darkness").
- Grand Theft Me: Does this to Ichiko after she dies from drowning in the ocean during a tidal wave. Throughout the game, he possesses her, usually enacting on murderous rampages whenever possible. Near the end, his possession's apparent by Ichiko's face being deformed into a single eye, before he ramps it up and turns her body into an Eldritch Abomination.
- Evil Laugh: In his own scene, he laughs with apparent joy when the siren rings of Mother's plan to use Spider's Thread to enter the human world. Well, it's 'apparent' because due to being underwater, and being non-human, it sounds like monstrous gargling. The scene is even labelled "Joy" in the link navigator.
- Kill 'em All:
- His initial motive. He wants to kill Mother, and when he's nowhere near her when he possesses Ichiko, he just randomly kills anyone and anything he comes across, especially yamirei and yamibito, since they're Mother's spawn.
- Because he doesn't really talk, we don't know if he has any plans after killing Mother, or even "why" he wants to in the first place.
- The Unreveal:
- Why does he want to kill Mother? Otoshigo's reasoning behind his grudge is never revealed.
- His true form is a mystery. The closest we get is in the beginning, when a large, silhouetted mass quickly scuffles around the ferry. Since its size and shape resembles his monstrous body in Yorito's final level, chances are that it's very much identical, with a few possible facial changes.
SIREN: Blood Curse
Howard WrightA 18-year old American boy who is living and studying in Japan. He is invited to the village by a mysterious e-mail from Sam Monroe.
- Action Survivor: He's a pretty standard slightly rebellious teenager and fits the description of the trope to a T, sans the stubble.
- The Chosen One: Miyako marks him as one, and Seigo pretty much calls him this.
- Expy: A pretty direct one of Kyoya, as opposed to most of the other cast, who each share traits with multiple characters from the original game. The only other character he shares traits from is Tamon Takeuchi in his fifth mission as he has to take out a sniper after it hits Miyako (Yoriko in the original) but otherwise, mostly Kyoya.
- Gratuitous Japanese: Since he is currently living in Japan, he has picked up on a few Japanese phrases.
- Static Character: We meet him saving Miyako from sacrifice. He spends the rest of the game doing either this or helping others (or killing shibito).
- Took a Level in Badass: By the end, which follows how close he's an Expy of Kyoya.
Melissa GaleThe divorced wife of Sam Monroe, mother of Bella Monroe, and the presenter of the TV crew that comes to Hanuda to investigate the legend of the vanished village.
- Body Horror: Eventually becomes the very same Maggot Shibito that had tried to kill her and her daughter in Episode 12.
- Composite Character: A combination of Reiko, Mrs. Maeda and Naoko.
- Defrosting Ice Queen: Is not particulary friendly with her ex-husband initially especially when he brings their daughter to Hanuda, but this all changes when they have a lead to finding their daughter, referring to his optimism fondly.
- Heroic Sacrifice: Just like Reiko of Siren 1, Melissa sacrifices herself twice to save her daughter, once as a human, and again as a Maggot Shibito.
- Red Oni, Blue Oni: The red to her ex-husband Sam's blue.
- Sanity Slippage: Being the sole survivor of her family in the first time loop, she still stays by her shibitofied daughter's and husband's side and is willing to kill anyone that comes between them.
Sam MonroeThe divorced husband of Melissa Gale and father of Bella Monroe. He is a professor of folklore and comes to Hanuda with the TV crew to serve as their expert on the subject.
- Badass Bookworm: His look and job suggests this, and it helps that he willing to do anything to protect his family.
- Composite Character: A combination of Tamon and Mr. Maeda.
- Papa Wolf: Considering he's willing to doom the whole cast into a Stable Time Loop so that his daughter "can exist forever"...
- Red Oni, Blue Oni: The blue to his ex-wife Melissa's red.
- Took a Level in Badass: In the second-to-last mission of the game, Sam incapacitates Maggot Shibito Melissa by throwing antennae at her, causing her to get struck by lightning when she climbs high enough on a nearby watchtower. Not only that, but Sam takes up a shotgun and blasts away every single Spider Shibito, including Sol, just to protect Bella from them. And when you consider how Spider Shibito are the quickest to recover, he held out pretty damn well.
Bella MonroeThe young daughter of Sam Monroe and Melissa Gale. Sam brings her along to their trip to Hanuda, much to Melissa's horror.
- Catch Phrase: Her recurring cries of "no, no, no!" may as well be.
- Children Are Innocent: Played with. As a child, she qualifies.
- Composite Character: A combination Harumi and Tomoko. And Hisako, once she grows up...
- Nightmare Face: She eventually becomes a Brain Shibito in the first time loop, where her face appears very much like the base of a bug.
- Infant Immortality: Subverted as she is killed by a large falling log thrown by an off-screen Maggot Shibito, and reanimates as a Shibito. After the first time loop, this is played straight.
Sol JacksonThe cameraman of the TV crew documenting the mysteries of Hanuda.
- Black Guy Dies First: Twice. And the second time Sam, who is in the very same situation that kills Sol, survives with no explanation. What the hell, game?
- Stalker with a Crush: He writes fanfiction about him and Melissa.
- We Hardly Knew Ye: He is killed off rather quickly in both timelines, and only has one episode dedicated to himself and Sam Monroe.
- Ate His Gun: As with Akira from the first game, and with just about as much effect. He does get the time reversal to bring him back, though.
- Badass Normal: He's armed with a shotgun that he snipes with. His introductory cutscene has him calmly blasting away at a group of shibito, including a police officer one, who hides behind a door to protect himself. Unfortunately, Seigo blows off its hinges and beats it at a quick-draw. Really, he's easily THE most badass character in the entire game.
- Composite Character: Poor Seigo's probably got it the worst out of the Blood Curse cast, having to cover the roles of Akira, Shiro and Jun, with a little bit of Kei thrown in.
- Driven to Suicide: During the first time loop.
- Enigmatic Minion: Was about to sacrifice Miyako, but when she escapes, he basically decides "Eh, to hell with it." lets her go, and proceeds to help out all these weird strangers that suddenly showed up. By the second time loop he's actively working against Kaiko and Amana for his own reasons.
- Hidden Depths: At first glance he comes off as nothing but a sociopathic nihilist (combination of Shiro and Akira), but when you realize he does care for Yukie, his demeanor is more understandable.
- Morality Pet: His associate and nurse Yukie was meant to be this, but then came the ceremony and they needed a sacrifice of a young woman, and well...
- Perpetual Expression: His eyebrows don't seem to ever move from the somewhat serious, somewhat smug expression they give.
- Screw Destiny: In the second time loop he decides to give this a shot.
- Thanatos Gambit: Attacks Howard to provoke him into activating the Uryen for the first time. (He'd have preferred to be the hero himself, but he didn't have enough of Miyako's blood in his veins to use the power of the gods properly).
- Nice Girl: Offers to help Howard to safety, though isn't able to do much after being captured by a shibito. Once her memory returns, however, she becomes colder and malicious.
- Really 700 Years Old: She ate the god hundreds of years ago, and looks like she's in her twenties.
- Used to Be a Sweet Kid: She was once a little girl called Bella Monroe, but after a traumatic trip to the village, being thrown back hundred years in the past, and finally undergoing a curse of immortality, she becomes Amana.
- Walking Spoiler: Just like Hisako Yao, but with a twist...
- Ambiguously Human: Miyako has a direct blood tie to the old gods from the Other World whom Hanuda once revered (Word of God specifically namechecks the Cthulhu Mythos), and whose worship was driven out by Kaiko-based Manaism.
- Cool Sword: The Homuranagi is a family heirloom.
- Expy: Of Miyako. Though she's not blind this time around.
- In the Blood: Literally. Since her blood was shared with Howard and Saiga (the latter via transfusion) her sacrifice isn't enough to raise Kaiko properly.
- Killed Off for Real: Just like the original Miyako, she is sacrified and thus killed in the second time loop.
- Last of Her Kind: The Manaists alternated between using her bloodline as sacrifices or revering them. Miyako seems to be the last one left.
- Mystical Waif: Her characterization in Blood Curse is closer to the archetype than it is in the original game.
- Big Creepy-Crawlies: Resembles a cluster of assorted insect appendages, constantly re-arranging itself
- Expy: Of Datasushi, serving exactly the role as in the original game, providing the same actions to boot. Then again, this could be because Datasushi didn't have much screentime in the original until the climax, as the whole point was resurrecting him in the first place.
- Greater-Scope Villain: Amana simply wants to resurrect him.