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.
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.
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.
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.
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.
Anti-Villain: In the end, his betrayal was brought about by him wanting to see his family again. He was never a bad man, jut 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.
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.
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.
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.
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.
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...
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.
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.
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.
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.
Dangerously Genre Savvy: He's a former mercenary, so doesn't need to rely on the game's functions as heavily as Ryota does. In episode 7, he uses tracking skills to follow Ryota back to where Himiko and Taira were at, and also uses a knife more than bombs to kill other players. He also booby traps a door in the event Ryota somehow makes it there, where Himiko is currently being held.
Determinator: Survives having his Blazing Gas Bim triggered by Himiko, and was still trying to disarm the Timer BIM before he died.
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.
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)