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Voiced by: Kanata Hongo (Japanese), Tyler Galindo (English)
- Above the Influence:
- When he defeats Himiko with her own stun gun, he's aroused by how good she smells and is barely able to resist temptation... not without giving us a Panty Shot first, of course. In the manga, he goes a bit further by lifting her skirt and actually touching her on the crotch before pulling her skirt back down and reprimanding himself.
- In the final episode, he kisses Himiko and it seems things are going to go a lot further between them. Even though she lays down on the couch and is not actively resisting him, he knows her Consent is very dubious, and this time he solidly refrains from doing anything further.
- Abusive Parents: His mother nominated him to go to the island, though in fairness he was quite abusive to her as well.
- Actual Pacifist: At first.
- Adult Child: Prior to the series, he's a 22-year old self-centered NEET prone to temper tantrums and leeching off his parents. He becomes much more mature as the series goes on.
- Battle Couple: With Himiko.
- Character Development: Becomes much more selfless and mature as the series progresses.
- Chronic Hero Syndrome
- Covert Pervert
- Crouching Moron, Hidden Badass: Quite badass for a guy who spends all day playing videogames.
- Cuckold: The entire situation with him, Oda, & Aiko in his high school days.
- Disney Death: After his first confrontation with Miyamoto.
- The Hero
- Heterosexual Life-Partners: Was this with Oda on their high school days, but it all went to hell when Oda slept with the girl Ryota had a crush on.
- Horrible Judge of Character: Unlike Himiko, he trusted Date right away… Though Himiko suspicions didn't start getting raised until after he detonated a remote bomb next to her and tried to play it off that he was saving her from Hidemi.
- Idiot Ball: For someone who was supposed to be a high-ranking player in the bomb-centered online game, it sure takes him a long time to figure out things which should be readily apparent. He doesn't recognize that the things in his bag are bombs, and somehow doesn't realize that the timer was counting down to an explosion, only throwing it away because 'he had a bad feeling'. Even after he figures it out, he still doesn't understand how to actually use them, such as not pressing the button when throwing it at the psycho chasing him across the island, and being shocked when it doesn't explode.
- I Know Mortal Kombat
- It's All About Me: How he was prior to the series. Major component of his Character Development was realizing this and growing out of it.
- Jerkass Realization: Comes to realize how self-centered he was at the beginning of the series and attempts to change himself.
- Neet: Before the start of the series, he would just spend all day playing video games.
- Pragmatic Hero
- Took a Level in Kindness: Becomes dramatically nicer than he was prior to the series.
- Tranquil Fury: Notably when he fights Miyamoto and Natsume. He even comments on it later to Himiko.
- Action Girl
- All of the Other Reindeer: Her desk at school even had written "Die" and "Betrayer" on it.
- Attempted Rape: Went through this twice.
- Battle Couple: With Ryouta.
- Barbie Doll Anatomy: During the opening credits.
- Beware the Nice Ones: If you're a man and get anywhere near her without her approval, don't expect her to have any mercy.
- Break the Cutie
- Broken Bird: She saw her friends raped, betrayed by them in retaliation, and narrowly escaped two attempted rapes. Probably the best thing that happened to her so far is meeting Ryouta.
- Closet Geek: Likes cosplaying and gaming, but she's not about to admit it to people she doesn't know.
- Damsel in Distress: Although there are moments where she shows herself to be capable, she frequently needs to be saved by Ryouta, such as when she is kidnapped by Miyamoto and Natsume.
- Does Not Like Men: Her previous experiences led her to distrust and fear men. Meeting Ryouta warms her up a bit, but only towards him; she remains the same towards other men. Even then she was still extremely distrustful of Ryouta; it was only after he risked life and limb to save her from Miyamoto that she began to be comfortable around him.
- Don't You Dare Pity Me!
- Fanservice Cover: Pretty much every cover with her on it.
- First-Name Basis: Shortly after Ryouta rescues her from Miyamoto, she starts calling him by his name.
- Gamer Chick
- Hair of Gold, Heart of Gold
- Hates Being Touched: By men, that is.
- Ms. Fanservice: Most of her panel time consists of some action (usually bad for her) that will force a suggestive pose on the girl; while grovelling in pain or fainting, Himiko will have her bosoms, legs or bottom in great view for the reader.
- Only Known by Their Nickname: Himiko is just her username at an online game. It is later revealed that her real name is Hemilia.
- Rape as Drama: Her reason for being sent to the island. She and some friends met with an upperclassman. Turns out they were a bunch of rapists. Himiko barely escapes them. Unfortunately, the same couldn't be said for her friends. They blamed her for running away and nominated her for the game.
- Shrinking Violet: Thanks to Ryouta, she's becoming more self-confident, but she still fits the trope to a T.
- Stun Gun: Carries a taser.
Survival Game Players
- Anti-Villain: In the end, his betrayal was brought about by him wanting to see his family again. He was never a bad man, just a very desperate one.
- Bad Boss: He admits that's probably the reason why he was sent to the island, saying that while he was good to his family, he was a monster at work.
- Better to Die than Be Killed: He does this to avoid being eaten alive by the komodo dragons, and partly to not slow down Ryouta any longer after he realizes the latter was still trying to help despite attacking them moments earlier.
- Big Fun
- The Big Guy
- Butt-Monkey: Nothing ever seems to go right for poor Taira, and is on the end of a lot of injuries. He twisted his right ankle. Then a Komodo dragon, whose bite is highly infectious, bit him and he spent a few days having a fever. Then he had his fingers sliced off by a Knife Nut. All in about 10 chapters, and it never gets better for him.
- Cowardly Lion: Despite being understandably terrified, he was always trying to be a good man ultimately his paranoia got the better of him.
- Driven to Suicide: In his final moments he finds himself surrounded by komodo dragons. He decides to put his last bomb to use.
- Face–Heel Turn: A very tragic one brought by his own Cowardly Lion tendencies that ultimately drive him insane.
- Fingore: In the fight with Miyamoto, he gets his fingers cut by him.
- Happily Married: He loves his family dearly, and wishes to get off the island so he can see them again.
- The Load: He tries to avoid it, but ultimately he becomes this after getting bitten by a komodo dragon, as he can't really do anything except rest and recover. One of the reasons he kills himself is because he doesn't want to slow Ryouta down.
- Mad Bomber: At the end of the anime.
- Mr. Exposition: He fills in for this during episode 3, telling Ryouta what happened on the plane ride to the island. He tells Ryota about how he was the most adamant against the game, causing the guards on the plane to taser him right in the head, which explains the blood on his head as well as his short term memory loss back in episode 1.
- Please Don't Leave Me: Taira begs Ryota not to leave him when the latter goes off to look for a kidnapped Himiko in episode 7. Ryota didn't like it, but he had little choice.
- Sanity Slippage: After Ryouta leaves him behind repeatedly.
- Woobie, Destroyer of Worlds: Sure he goes insane and tries to kill Ryouta, but its not hard to see why the pressure would get to him.
Voiced by: Miyuki Sawashiro (Japanese), Chelsea McCurdy (English)
- Abusive Parents: His father abused him pretty badly. The result of the abuse was not good.
- Ax-Crazy: Laughs after killing his own father, and overall shows a psychopathic glee towards the idea of killing people.
- Creepy Child: Oh, so much.
- Cute and Psycho: He can actually appear to be a fairly cheerful kid. Then you find him gleefully squashing frogs for fun, laughing after killing his abusive father, and hear about his disturbing back story.
- Death Seeker: He does not mind death, if it's Ryota who kills him.
- Freudian Excuse: His father's abuse.
- I Love the Dead: He killed three women previous to the survival game start. Then he raped them.
- Kids Are Cruel/Teens Are Monsters: He's quite the psychopathic nutjob for a 14 year old.
- Laughing Mad: Right after making his father explode.
- Mad Bomber
- The Mentally Disturbed
- Rape as Backstory: His father did not just abuse him physically...
- Sanity Slippage: At some point before the story, he snaps and kills and rapes three women. And the only thing that keeps his insanity at bay is the fear of his father and well... that does not end well...
- Slasher Smile
- Self-Made Orphan
- Wise Beyond His Years: It's hard to remember sometimes that he's only 14.
- You're Insane!: He gets this from Natsume, his lawyer, after killing his father.
Voiced by: Yuuichi Nakamura (Japanese), Crash Buist (English)
- The Ace: Ryota notes that he was always the best at everything, whether grades or sports, and was extremely popular with his peers.
- Bishōnen: Mostly on high school flashbacks.
- Broken Ace
- Chick Magnet: According to Ryota, he attracted the attention of a lot of women. He even worked at, and eventually ran, a host club.
- Cool Shades: He combines these with a tattoo, fuzzy facial hair, and cavalier attitude for maximum coolness.
- Heterosexual Life-Partners: Was this with Ryota on their high school days, but it all went to hell when he slept with the girl Ryota had a crush on.
- Mad Bomber
- Tattoo as Character Type
- Battle Couple: Was this with Shiki before betraying her.
- Bitch in Sheep's Clothing: Pretends to be a polite and friendly doctor concerned for everyone's well-being, but he actually holds nothing but contempt for damn near everyone, and will betray you in a heart-beat.
- Boom, Headshot
- Chronic Backstabbing Disorder
- Deadly Doctor
- Easily Forgiven: By, of all people, the woman who he ends up betraying three times!
- Four Eyes, Zero Soul
- Hoist by His Own Petard: While he isn't killed by it, Date is brought down by his own trap after Ryouta managed to move it without him knowing.
- Jerkass: Under his friendly façade is a spiteful man who spends three quarters of his inner monologue insulting everyone.
- Mad Bomber
- Manipulative Bastard: In the first game, he used Shiki to commit the kills and then took her arm, abandoning her on the island. On his second time on the island, he's not much better either...
- The Medic
- Morally Ambiguous Doctorate: So morally ambiguous that he was sent to the island twice.
Voiced by: Rika Fukami (Japanese), Maggie Flecknoe (English)
- Ax-Crazy: Being stuck on an island for a survival game for six months does that to you. She does this more often than not for mere intimidation value, though, as she doesn't want anyone to stay near her shelter.
- Battle Couple: In the previous game, she was this with Date, but then he betrayed her.
- Blinding Bangs
- Does Not Like Men
- Girl with Psycho Weapon: Her weapon of choice is a Kama.
- I Was Quite a Looker: Before the survival game started. She's not even 40 yet, but losing an arm and spending 6 months living alone on the island sure did a number on her.
- Love Makes You Dumb: Her crush on Date caused her to be kicked out of the hospital she worked at for covering for him, and later in the survival game, she trusted him again... only to be betrayed by him again.
- The Medic
- Weapon of Choice: Her Kama.
- You Have Outlived Your Usefulness: Date attempts to kill her (and believed to have done so) after he callects enough shards to leave the island.
Voiced by: Takaya Kuroda (Japanese), Jovan Jackson (English)
- Awesome Mc Coolname: Just one vowel away from Miyamoto Musashi.
- Body Horror: After Himiko manages to set off a gas bomb he was carrying on a bandoleer, his skin starts to melt off. It's not a pretty sight, and it still wasn't enough to get away from him.
- Cold-Blooded Torture: Planned to do this to Himiko, such as stripping away her skin and seeing how long she can survive for. Thankfully he doesn't have the time to enact it.
- Determinator: Survives having his Blazing Gas BIM triggered by Himiko, and was still trying to disarm the Timer BIM before he died.
- Expy: He's basically an evil Rambo.
- For the Evulz: When he and Natsume capture Himiko, she begs them to kill her quickly, promising not to resist, in exchange for them not raping her. Miyamoto says he doesn't have any plans for that, but instead wants to torture her, just for the hell of it.
- Hoist by His Own Petard: The Timer BIM he tells Natsume to set to three seconds is the one that ultimately does him in because he couldn't throw it away in time.
- Knife Nut: And it's his Weapon of Choice. It also gives him an advantage, since he isn't restricted to using BIMs to fight.
- Scarily Competent Tracker: Initially gives him a huge advantage in the game. As he is familiar with jungle survival, he doesn't need to use the radar to track his opponents effectively.
- Boom, Headshot
- Go Out with a Smile
- Forehead of Doom
- Heroic Sacrifice: Also doubles as a Dying Moment of Awesome since after getting shot in the head, in her leg, AND two more times in the chest she uses the bomb Ryota gives her to kill the pilot while flipping the bastard off.
- Ms. Fanservice
- Pipe Pain
- 'Tis Only a Bullet in the Brain: She get's shot at point blank range and she's still alive.
Voiced by: Tooru Nara (Japanese), Patrick Poole (English)
- Ax-Crazy: He wasn't at first, but he develops this by Episode 7. He starts spouting off a self-defense law so as to avoid being charged for murder and to justify him killing people.
- Sanity Slippage: Was actually fairly pacifistic at first, expressing disapproval over Kousuke's sadistic tendencies. When he shows up again after teaming up with Miyamoto, he's clearly lost his mind, and developed his own sadistic side.
- You're Insane!: To Kousuke after he kills his abusive father. Natsume abandons him, insults him, and then claims Kousuke to be no better than his father.
Voiced by: Yasuhiro Mamiya (Japanese), Mark Laskowski (English)
- Attempted Rape: Attempts to rape Himiko, and is then killed for it.
- Bitch in Sheep's Clothing: Seemed like the most decent member of his group when he was introduced, but he showed his true colors once he was alone with Himiko.
- Fat Bastard: While at first he seems like a pretty decent guy for the most part, after escaping from Miyamoto with Himiko, the stress makes him snap, and he attempts to sexually assault her.
Voiced by: Tooru Nara (Japanese), Joshua Sheltz (English)
- Delinquent: Was this before the island.
- Functional Addict: Addicted to pills, but still managed to keep Ryouta on the run for most of their fight.
- Starter Villain: For Ryouta.
- Abusive Parents: Towards his son, Kousuke, both physically and sexually.
- Asshole Victim: He was a complete asshole who deserved what he got.
- Jerkass: Even putting aside his horrendous abuse towards his son, he is a massive asshole who enjoys intimidating smaller opponents into submission.
Voiced by: Yasumichi Kushida (Japanese), Parke Fech (English)
- Badass Teacher: A kind, responsible middle school teacher with a muscular build and a sixth degree black belt in Judo. Somewhat subverted when his strength and skill fail to protect him from an unexpected dagger to his throat.
- Informed Ability: He mentions having a black belt in Judo, and his rugged physique certainly suggests he's pretty athletic. But Masashi slits his throat before we see if he can back up his claims.
- Named After Somebody Famous: Like most of the cast, he's named after a figure from Japanese history. In this case Isami Kondo, commander of The Shinsengumi.
- Reasonable Authority Figure: Tries to be this for his group, lecturing them on the importance of rationing supplies.
- The Idealist: He espouses morality, civility and pacifism on an island where everyone is trying to blow each other to smithereens.
- "I'm a teacher! No matter the situation, we will do what's right and just!"
- Slashed Throat: How Miyamoto kills him.
Voiced by: Mai Tōdō (Japanese), Brittany Deans (English)
- We Hardly Knew Ye: She's killed by Oda in her very first scene.
- The Leader: Of his alliance.
- Parental Substitute: A better father figure to Kousuke than Yoshihisa ever was.
- Pet the Dog: He treats Kousuke respectfully.
Voiced by:Shiori Mikami (Japanese), Margaret McDonald (English)
- A-Cup Angst: Miho feels quite... small compared to Himiko.
- Broken Bird
- Genki Girl
- Rape as Backstory
- "The Reason You Suck" Speech: Delivers one to Himiko before enlisting her to the Btooom! real-life game.
Voiced by: Ayumi Kida (Japanese),
- Abusive Parents: Signs up her own son for the Btooom! game. Although she gravely regrets this. To be fair, he wasn't exactly the nicest son to her.
- Bath Suicide: She attempted to kill herself by slitting her wrist in the bathtub when the full horror of the fact she basically sold off her son to die in a Deadly Game hit her.
- Butt-Monkey: Her first marriage goes down the drain as her husband is constantly at work. When she remarries, her son throws a temper tantrum and assaults his step-father. Then her son becomes a jobless NEET while her new husband gets laid off from work. This all contributes to her nomination of her own son, which she ends up greatly regretting.
- Driven to Suicide: After sending her only son to the island.
- Dull Eyesof Unhappiness: Practically every time she's on screen.
- My God, What Have I Done?: Shows great regret after nominating her son for the real life Btooom! game, as she tried to kill herself in repentance.