Voiced by: Kosuke ToriumiThe protagonist. He is the reigning champion of Bl@ster, a series of street brawls, and childhood friend to Keisuke. When he is falsely accused of murder, he faces life imprisonment...until he is approached by a mysterious duo; Emma and Gwen. In exchange for his freedom, they send him to Toshima, a city ravaged by the war, and participate in the game of Igra. Upon arriving, he learns that Igura is completely different from the street brawls of Bl@ster, and in Toshima, it's either kill or be killed.
- A Man Is Not a Virgin: Averted, it is clearly stated Akira is a virgin, and struggles to feel comfortable during sexual encounters.
- Blessed with Suck: Turns out he was a part of Project Nicole, a genetic engineering program to create a drug which enhances the natural capabilities of humans. His blood is the antidote for said drug, and is the reason he is framed for murder and placed in Igura: Emma wants to use him to lure Nano out, whose blood is the source of said drug.
- The Determinator: When he first encounters Shiki, who is supposedly invincible, he refuses to run away, glaring at him despite a blade pressed to his neck. During his second encounter, he tries to block his sword with his knife, and succeeds for a while.
- Even the Guys Want Him: Of course, in the BL Visual Novel.
- Gray Eyes
- Heroic BSOD: Experiences this shortly after fighting with Line-addled Keisuke.
- Heroic RROD: Also after fighting Keisuke, where he struggles to merely keep awake.
- I Can Still Fight
- Lack of Empathy: Arguably, to Keisuke, depending which route the player takes.
- Weak, but Skilled: Compared to abnormally powerful characters and Line users. Although his physical strength is inferior, he strategically reads and analyses his enemies' movements to find openings and ways to avoid attacks. He exploits these to the utmost rather than swinging his weapon around randomly like some other characters.
- Wimpification: Debatable and may or may not be justified or even exist depending on which route is taken. He starts off as a strong and confident fighter, with no need to rely on anyone else. When he encounters certain sex scenes, he becomes like a typical Uke. This is justified through excessive guilt from the death of Keisuke in Shiki's route.
Voiced by: Tomokazu SugitaAkira's longtime friend, having lived in the same orphanage at the same age. After learning Akira has been sent to Toshima, he follows Akira with a vague knowledge of the dangers of the city. In contrast with Akira, he is quite meek until he takes the drug Line, after which he becomes a Yandere.
- Adorkable: Arguably the main appeal of his character before the whole Yandere thing happens.
- Brown Eyes
- Cannot Spit It Out
- Corrupt the Cutie: What happens to him when he takes the drug Line.
- Curtains Match the Window
- Dogged Nice Guy
- From Nobody to Nightmare
- Incompatible Orientation
- Insecure Love Interest
- Kill the Cutie: Occurs in every route save his own.
- My God, What Have I Done?: In his route, after getting the Line out of his system, he has this reaction to realizing that he murdered a LOT of people and raped Akira while under the influence. However, after Akira forgives and encourages him, he becomes The Atoner.
- Non-Action Guy: Just sits in the background doing nothing in particular.
- Rape as Drama: Inverted. Although he rapes Akira, he later apologizes for his actions and the rape becomes the subject of his nightmares.
- Shrinking Violet: During conversations with other characters, he usually fades into the background to the point the audience forgets he is there.
- Single-Target Sexuality: In his route, he describes his feelings for Akira as being this.
- The Load: A part of why he feels inferior to Akira.
- Too Dumb to Live: What do you do when you can't fight and your best friend is sent to a city-wide battle royale where the cost for loss is death? You follow him, of course!
- Took a Level in Badass: If he survives having Line in his body neutralized by Akira, not only does he gain a noticeable increase in strength and mental aptitude, he becomes less emotionally dependant on Akira and is able to find the resolve to participate in a fight against multiple enemies and win.
- Unlucky Childhood Friend: Lived in the same orphanage as Akira.
- Victorious Childhood Friend: In his route.
Voiced by: Jun FukuyamaA helpful young boy who has been participating in Igra long before Akira and Keisuke arrived in Toshima. Many people mistake him for a girl. He enjoys taking photos.
- Badass Adorable
- Cain and Abel: His Cain to Shiki's Abel. Too bad for him it's not working out so well.
- Cute and Psycho Is very nice and cheerful and also a mentally damaged Death Seeker who will try to kill anyone in the way of his revenge.
- Cute Bruiser
- Death Seeker: Wants to kill Shiki or die trying to avenge his friends.
- Dude Looks Like a Lady: The text of the novel states he is a "little girl" until Akira observes him closer.
- Hair of Gold, Heart of Gold: Is extremely friendly and generous to Akira and Keisuke, even trading his own tags for supplies when they are injured. Until he stabs Akira in the back and takes his tags to face Il Re anyway.
- He Is All Grown Up : His good ending.
- Knife Nut
- No Sense of Personal Space: During his first encounter with Akira and Keisuke, he happily huddles up with them, one on each arm, making the two feel rather uncomfortable.
- Pintsized Powerhouse: The shortest and youngest member of the cast, but he can easily defeat several Igura participants. At once.
- Stepford Smiler: On the surface, he appears almost suspiciously as a cheerful, upbeat person in a Crapsack World. Later in the story, it is revealed his friends have been killed by Shiki, who also happens to be his older brother, and is participating in Igura to exact his revenge.
- Sugar and Ice Personality: Throughout his route, the two become become so extreme Akira begins wondering which is the real Rin.
- Survivor Guilt: Due to Shiki killing his friends. Akira and Power of Trust are needed before he can get over it by the end of his route.
- Waif-Fu: Demonstrated in the anime, where he defeats an opponent through the use of acrobatics.
Voiced by: Kazuya IchijōAn older man living in Toshima as an information broker.
- Cool Old Guy
- Determined Widower
- Knowledge Broker: He states he is an information broker, but we rarely see him giving information other than common knowledge about Igura to the protagonists. This is until he has an audience with Arbitro, where he uses previously unknown information to interrogate him. In his route in the game, he reveals even more information to Akira about Project Nicole, and comes complete with the romantic subtext.
- Non-Action Guy: Chooses to be an information broker instead of participating in Igura. However, he still keeps a gun for self-defense.
- Only Sane Man: He is the only person in the main cast who isn't obsessive, craves killing, mentally wounded from past events, or apathetic towards things which should be important to them.
- Roaring Rampage of Revenge: Averted in that even that though Nano is responsible for his son's death and indirectly for his wife's, he doesn't want to kill Nano for revenge. He wants to do it in order to stop the spread of Line.
- The Medic: Before coming to Toshima, he used to be a medic during WWIII.
- The Smart Guy: Extremely knowledgeable about Igura, and the people controlling it. He used to work as a scientist in ENED, and therefore has had access to information he can use as leads to investigate further.
Voiced by: Hikaru MidorikawaA powerful and feared man who mysteriously appears in front of Igura participants and kills them.
- Badass Longcoat
- Bastard Boyfriend: To Akira in his route. Not like most of the fans are bothered by this.
- Hot Guys Are Bastards
- I Love You Because I Can't Control You: Towards Akira's unwillingness to surrender to him.
- Katanas Are Just Better: His weapon of choice, and is frequently shown slicing Igura participants (on Line) with hardly any effort.
- Red Eyes, Take Warning
Nano/ Nicole Premier
Voiced by: Takumi YamazakiA mysterious man who is being pursued by Emma and Gwen.
- Charles Atlas Superpower: Appears to have this, being capable of holding a man and strangling him with one hand effortlessly despite a scrawny physique. Then, we find out he is the product of Project Nicole, to create the ultimate soldier.
- Cloud Cuckoo Lander: Spending most of his time in a lab caused him to have a very limited knowledge on basic living. For instance, he survives on eating tree bark, and in an attempt to eat a Solid, he forgets to remove the wrapper first.
- Creepy Monotone: Combined with slow speech.
- Emotionless Guy: This is explained by the manipulation of his genetic features in Project Nicole, which resulted in suppression of emotions, allowing to become 'invincible' as per the goal of the project.
- Purple Eyes: Or more specifically, light blue eyes which turn purple on occasion.
- Super Strength
- These Hands Have Killed
- The Stoic
- When He Smiles: During the end of his route.
Voiced by: Takezou Koike, Hideki Ogihara
- Big Brother Instinct
- Eyepatch of Power
- Honey Trap: Resorts to this to get tags
- Roaring Rampage of Revenge: Attempts this against Il Re, the circulator of Line, the drug responsible for the degradation of his family, especially his mother.
- Sacrificial Lion: He is a powerful fighter, able to go toe-to-toe with Akira, a Bl@ster champion in a veteran's region. He survives in Toshima on his own, unlike others who are part of a small gang who tend to look out for each other. Despite this, he is convinced to take a dosage of high-concentration Line, only to have it painfully neutralized by Akira's blood. In his weakened state, he is promptly killed by Line-addicted Keisuke. This is the first major indicator that Toshima is dangerous for reasons other than Igura.
Voiced by: Kousuke OkanoA high-up of the drug syndicate Vishico, which is responsible for distributing Line.
- Berserk Button: Motomi who got him fired from ENED once he discovered his hobby of mutilating young boys.
- Depraved Homosexual
- Evil Make Over /Fashion-Victim Villain : Believe it or not, Arbitro didn't always look so garish. He used to have short, black hair, wear glasses, and sported a lab coat while he worked at ENED.
- Faux Affably Evil: He is extraordinarily polite and invites Akira to dinner, offering him some bread... laced with drugs.
- Freudian Excuse: His parent's neglect in favor of gathering young children to abuse left him wanting his own collection of 'dolls' to play with.
- Impossibly Tacky Clothes: Akira's first impression of him is how bad his taste in clothing is. Many other characters also point that he has 'bad taste'.
- Nightmare Fuel Station Attendant
- Shota Con: Prefers young boys or underdeveloped males. The few women he does have in his collection are only prizes for participants and are extremely emaciated.
The Executionerskill people randomly for fun. Consists of Gunji and Kiriwar.
- Beware the Silly Ones
- But for Me, It Was Tuesday: Igura participants make a big deal of when they randomly kill people for fun. However, the Executioners themselves shrug it off and pay no mind to it.
- Dumb Muscle: They are extremely strong fighters, able to kill a standard Igura participant with hardly any effort. However, Gunji is dimwitted, and Kiriwar confuses cats with dogs.
- I'm a Humanitarian: Implied what Kiriwar may with some of the participant he captures in his ending.
- Murderers Are Rapists
- Psychopathic Man Child: They speak with childish mannerisms... while beating the living daylights out of you.
Voiced by: Asako DodoA mysterious woman who approaches Akira, offering him freedom from prison in exchange for his participation in Igura. She is cold and calculating.
- Absolute Cleavage: Wears her jacket with zipper halfway down.
- Chekhov's Gunman: Appears in the beginning of the story to release Akira from jail. Later, she re-appears, revealing she knows about Nicole Premier, Akira's capability of neutralizing Line and is out to kill Nano, the source of Line fuelling Igura.
- Et tu Brute: She kills Gwen near the end of the anime when he disagrees with her.
- Evil Redhead
- Manipulative Bastard
- Revolvers Are Just Better
Voiced by: Takuo KawamuraEmma's right hand man.
- Expy: He looks like the splitting image of Phoenix Wright and shows especially when he's the Only Sane Man of the series.
- Only Sane Man: The only character outside the main cast to be reasonable and clear-headed.