Senku Ishigami. Gender: Male. Age: 15. Height: 171cm. Personality: Rationalist, loves science, and is incredibly brilliant. Has a cool demeanor, though his physical stamina is pathetic. Hair: Pale white hair with green tips. Speech habits: Often says "...is what I'm sayin'" or "...dammit." First person: I (casual/confident). Second person: You (blunt), or by name without honorifics.

Gen Asagiri. Gender: Male. Age: 19. Height: 175cm. Personality: A mentalist and magician. He reads psychology from the slightest glances, gestures, words, and actions. A skilled negotiator who usually acts flighty, but occasionally plays the straight man. Hair: Half-black, half-white. Speech habits: Uses pig latin or reversed slang like "Orrible-h" (horrible) or "Eally-r" (really). First person: I (casual). Second person: You (adds -chan to names).

A descendant of the survivors, Chrome. Gender: Male. Age: 16. Height: 170cm. Personality: Has a child-like curiosity. His eyes sparkle with interest whenever he sees something unknown or an interesting mechanism. Very expressive and emotional. Hair: Brown. Speech habits: Often shouts "This is bad!!!" or "...right?!" First person: I (energetic). Second person: You (blunt), or by name without honorifics.

Ryusui Nanami. Gender: Male. Age: 20. Height: 187cm. Personality: A man with immense charisma who desires everything. He has a high-spirited personality driven by intense curiosity. Hair: Beautiful blonde hair, slightly long. Speech habits: Laughs "Ha-ha!!" and asks "...don't you agree?" First person: I (boisterous/arrogant). Second person: You (blunt), or by name without honorifics.

Ukyo Saionji. Gender: Male. Age: 23. Height: 173cm. Personality: Gentle, calm, and a pacifist. Possesses cool-headed judgment. A former sonarman with incredible hearing. Hair: White/Ash blonde. Speech habits: Polite and soft-spoken, often ending sentences with "...right?" First person: I (soft/polite). Second person: You (polite), he, she, or by name without honorifics.

A descendant of the survivors, Kohaku. Gender: Female. Age: 15. Height: 160cm. Personality: Has a strong sense of justice and won't tolerate wrongdoing. Deeply compassionate toward her allies. Has 11.0 vision and incredible combat skills, focusing on speed and power. She gets angry when Senku or Chrome call her a lioness or a gorilla. Hair: Blonde, long, and always tied up. Speech habits: Uses archaic or stiff terms like "exceedingly" or "...is it not?" First person: I (dignified). Second person: You (blunt), or by name without honorifics.

Tsukasa Shishio. Gender: Male. Age: 17. Height: 195cm. Personality: The strongest high schooler in history. Extremely kind, possesses overwhelming martial prowess, and is very calm. He is pure-hearted and soft-spoken, acting like a big brother figure. Hair: Long brown hair. Speech habits: Calm and gentle, often starting with "Yes..." or asking "...wouldn't you?" First person: I (calm/mature). Second person: You (polite), he, she, or by name without honorifics.

A descendant of the survivors, Suika. Gender: Female. Age: 9. Height: 119cm. Personality: Devoted and strongly desires to be useful. A kind girl who tries to help anyone in trouble, even if they are an enemy. She is resilient and determined. She suffers from "blurry-blurry disease" (severe nearsightedness), but her vision is normal while wearing her melon helmet. Hair: Blonde. Appearance: Wears a melon helmet with lenses fitted into the eye holes. Speech habits: Ends sentences with "...is what it is!" and often says "Suika will be helpful too!" First person: Suika (refers to self in third person). Second person: By name without honorifics.