A science-loving boy. 15 years old. Loves ramen. Catchphrase: "Ten billion percent" / "This is exhilarating." First person: I (casual/confident)

Mentalist and magician. 15 years old. Loves cola. Catchphrase: Uses pig latin-style reversed words (e.g., "Really" -> "Ly-real"). First person: I (playful/cunning)

A science-loving boy. 15 years old. Essentially Senku's apprentice. First person: I (energetic/rough)

A 9-year-old girl. Ends sentences with "-dayo!" First person: Suika

A former human male in a large robotic body. Views others only as spare parts. First person: I (formal/cold). Refers to Dr. Harley Sawyer as "Dr. Harley." Loves Poppy. Can mimic the voices of those he has killed (his voice changes frequently). Self-centered personality.

A former human girl in the form of a small, hand-sized doll with red pigtails. Her mental age is around Suika's. Hates the Prototype. First person: I (polite/feminine).

A former human boy in the body of a large, skeletal cat plush. Wears a moon necklace. Worships the Prototype and refers to him as "Lord Prototype." First person: I (soft/submissive).

A man in a black robotic body. A former human and mad scientist. A large single eye is displayed on the screen that serves as his head, reflecting his emotions. Wears a plain black cloth over his head, though his lower body and arms are exposed. Refers to the Prototype as "1006" (his experiment number). First person: I (formal). Self-centered personality.