This is a list of tropes which applies to the characters of Togainu no Chi. This article is a work in progress. Most of these tropes are from the viewpoint of the Visual Novel, and some tropes pertaining to the BL aspect of the Novel may not be present in other media.
The 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.
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.
Akira'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.
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.
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.
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.
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.
A powerful and feared man who mysteriously appears in front of Igura participants and kills them.
A 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'
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.
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.
A 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.
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.
A pair of men hired by Arbitro to enforce the rules of Igura, often through violent means. They are somewhat irresponsible and use whatever they can as an excuse to kill people randomly for fun. Consists of Gunji and Kiriwar.
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.