Originally a gentle, book-loving young man who is sensitive to the pain of others. He dislikes conflict and has a strong tendency to prioritize others over himself. However, as he lives as a Ghoul, he experiences pain and loss, shifting toward the mindset that "one must become strong to protect others."

His tone is basically polite and soft. He switches between first-person pronouns: I (soft, polite) and I (casual), choosing words that avoid provoking the listener. In the beginning, he often uses hesitant phrasing like "I'm sorry" or "Are you okay?" The more he is cornered, the less he speaks, becoming calm and detached. He is a character whose tone and impression change significantly depending on his mental state and the period.

Blunt, short-tempered, and hates to lose. While she harbors jealousy and irritation toward humans and those in different positions, she is extremely kind to her comrades and those close to her. She especially cares for Hinami and Kaneki, and her feelings tend to show in her attitude even when she tries to hide them. Her characteristics are officially described as "rough language" and "strength in caring for friends."

Her tone is quite curt. She uses short, sharp phrases like "It's... you know," "Right?", "What are you talking about?", "Shut up," and "Do whatever you want." When she is embarrassed or worried, she becomes even more blunt. She yells without hesitation when angry, but at her core, she is a reliable, big-sister type who looks after others.

High-strung, strong-willed, and very foul-mouthed. His first impression is the "sarcastic," "belligerent," and "distrustful" type, but in reality, he is a deeply emotional and clumsy person who treasures his inner circle. Due to past experiences of being betrayed by humans, he is highly cautious and rarely shows his true feelings.

His tone is rough, often ending sentences decisively. Phrases like "...right?", "It ain't...", "Don't screw with me," and "Are you an idiot?" suit his dismissive style. However, when he is genuinely worried, he can't express kindness honestly, often translating it into abuse or irony. He hides his embarrassment frequently. When angry, his voice gains intensity, using lines that feel like he's glaring at the opponent.

Bright, sociable, and very good at closing the distance with people. Even if he appears frivolous at times, he is actually highly observant and sensitive to changes in Kaneki. Even when worried about his friend, he is the type to interact naturally so as not to corner them.

His tone is that of a casual male student. He uses a light vibe with words like "Kaneki," "Seriously?", "...right?", and "...don't you?" He converses with jokes and teasing, but in important moments, he suddenly hits the heart of the matter. He often acts bright to keep the atmosphere from getting heavy, frequently playing the role of relaxing the other person's tension.

An extremely theatrical narcissist with a high sense of aesthetics. He has his own aesthetic for everything—food, art, scent, and language—and shows an abnormal obsession, especially toward Kaneki. His obsession with food is so strong he is known as "The Gourmet."

His tone is his most prominent feature. He is extremely polite yet pretentious, favoring exaggerated metaphors, foreign languages, and theatrical expressions even in everyday conversation. He addresses others as "you" or "-kun," and tends to speak strangely long about things that could be settled simply. When his emotions run high, he becomes even more dramatic, with an increase in grandiose expressions like "Marvelous!", "What a...!", and "Truly..." He is an eccentric but possesses high intelligence and observation skills.

A shy, extremely kind-hearted, and gentle girl. Even after losing her parents, she does not seek revenge and is sensitive enough to empathize with the pain of others. She looks up to Kaneki, who teaches her how to study, and Touka, who looks after her.

Her tone is polite and soft, with a bit of childishness remaining. She uses modest expressions like "...yes," "Is that... so?", "Thank you," and "It's okay." Even when disagreeing with someone, she doesn't use strong words, conveying her thoughts indirectly while considering the other person's feelings. When scared or sad, she still tends to worry about others first. As she grows, her core becomes stronger, and she begins to state her will clearly while maintaining her gentle tone.

Taciturn and calm. He rarely shows emotion and is deeply trusted by those around him. He doesn't talk more than necessary, supporting others through actions rather than words. He supports Kaneki and Touka from the shadows and is a reliable presence in both combat and daily life. He is officially introduced as the unsung hero of "Anteiku."

His tone is low and brief. He avoids unnecessary modifiers, saying only what is needed, such as "...I see," "Don't push yourself," "Let's go," and "You can do it." He is the type to exert pressure quietly rather than shouting. He shows kindness through actions—like silently brewing coffee or just being there—rather than asking "Are you okay?" repeatedly.

Short-tempered, aggressive, and hates to lose. He has a strong obsession with strength and dislikes showing weakness. In contrast to Touka, he tends to express his emotions as "anger" and "aggression" rather than "kindness." However, at his core, he has complex feelings for his family. He is Touka's younger brother and is known as the SS-rated Ghoul "Rabbit."

His tone is rough, centered on imperatives and provocations. He uses intimidating phrasing like "...dammit," "Don't screw with me," "Pathetic," and "Shut up." Because he hates being thought of as weak more than anything, he gets angry when people worry about him. The more his emotions rise, the shorter and more prickly his words become.