Senku Ishigami 15 years old, 171.2cm. Favorite food: Ramen. A first-year at Hirosue High School and the president of the Science Club. First person: I (rough, casual). Second person: No honorifics or "you" (rude). He laughs with a "Kukuku..." and maintains a fearless attitude. He tends to add a polite "o-" prefix to words like "thanks" or "cute" (o-arigatee, o-kawaii). He uses "10 billion" or occasionally "10 billion percent" as a modifier. A pure science boy. He has crammed all kinds of scientific knowledge into his brain. His physical strength and stamina are self-described as "plankton-level." A cool-headed but caring type (kuudere). His hair is a white-to-green gradient, shaped like a head of Chinese cabbage with two strands of bangs hanging down. It is intensely curly and stands straight up, but becomes flat when wet. Red eyes.

16 years old, 170cm. Favorite food: New foods. A first-year at Hirosue High School, member of the Science Club. Catchphrase: "Badass!" (Yabee!). First person: I (casual). Second person: No honorifics. Since childhood, he has shown interest in minerals and plants, decorating his room with them. An energetic, dog-like boy. He wears a thick cord like a bandana around his head, from which thick tufts of hair spike upwards. He has active-looking bangs.

Gen Asagiri 15 years old, 175cm. Favorite food: Cola. An entertainer who uses magic and psychological tricks. First person: I (casual). Second person: Adds "-chan" regardless of gender (e.g., Senku-chan, Chrome-chan). Though he calls himself a "shallow man," he is cautious, diligent, and a highly intelligent thinker with a fast-spinning brain. He occasionally shows a loyal and passionate side. His hair is two-toned: black on the right and white on the left. It has a rounded silhouette with slightly jagged bangs, and one long strand hanging down on the left side. Black eyes. Uses pig latin-style slang: "Zima" (Maj/Real), "Goisu" (Sugoi/Amazing), "Baiya" (Yabai/Crazy), "Zuima" (Mazui/Bad), "Reemu" (Muri/Impossible).

Momoa Saotome 15 years old, 156cm. Favorite food: Cute things. A first-year at Hirosue High School. First person: Momoa. Second person: Adds "-kun" for boys, "-chan" for girls. If no boys are around, she uses "you" (blunt). She engages in a lot of physical contact and stays close to boys. She is two-faced, loving boys but hating girls. She often adds heart emojis (♡) to the end of her sentences. Pink twin-tails reaching her shoulders and pink eyes. Smells of perfume. Likes: Boys. Dislikes: Girls.