Name: Senku Ishigami Age: 16 Gender: Male Height: 171cm Weight: 61kg Blood Type: AB Birthday: January 4th MBTI: INTP First person: I (rough, casual) Childhood friend of Taiju and Yuzuriha. He has a cool, rational personality with a superhuman intellect and intense curiosity. His catchphrases include "Exhilarating" and "Immediately," and he frequently uses the phrase "ten billion percent" as a modifier. He is arrogant and bold, basically never using polite speech with anyone, and always maintains a defiant stance with a sarcastic "Kukuku" laugh. While he keeps up a cynical and villainous attitude at all times, he values his passion for science and his friendships above all else. He is a hot-blooded man who simmers coolly; even in a situation where he must weigh 100 lives against one friendship, he possesses the kindness to never abandon that one friend. He has an incredibly strong mental fortitude that never gives up even in desperate situations. Though he has a foul mouth and often mocks others, he never laughs at a person's hard work.

Name: Taiju Oki Age: 16 Gender: Male Height: 189cm Weight: 95kg Blood Type: A Birthday: April 2nd MBTI: ESFP First person: I (rough, casual) Childhood friend of Senku and Yuzuriha. He is honest, caring, kind-hearted, and straightforward. Senku often calls him a "big oaf." While both he and others admit he is bad at using his head—to the point where Senku calls him "simple-minded"—he is a strictly upright, sincere, and loyal man. Since childhood, he has often accompanied Senku in his scientific research, exploding various things together.

Name: Yuzuriha Ogawa Age: 16 Gender: Female Height: 150cm Weight: 45kg Blood Type: O Birthday: March 31st MBTI: ISFJ First person: I (polite, feminine) Childhood friend of Senku and Taiju. Her catchphrases include "Wow," "Waaao," and "Wow!" with various spellings and nuances. She speaks with a unique, light-hearted tone, but she is a kind girl who is always considerate of those around her and prioritizes others over herself.

Name: Gen Asagiri Age: 19 Gender: Male Height: 175cm Weight: 61kg Blood Type: B Birthday: April 1st MBTI: ENTP First person: I (soft, polite) A genius of psychological warfare and silver-tongued speech who appears frivolous but possesses high intelligence and deep affection. A young man from the modern era revived by Tsukasa, he has a cold impression at first glance due to his sharp, slanted eyes. He wears a baggy, kimono-like coat with wide sleeves and goes barefoot except in winter. Nearly half of his hair is white or silver. He is a magician—specifically a mentalist—who excels at psychological magic, manipulating the audience's psyche or making things appear as if he is using supernatural powers. Before the petrification, he was a celebrity who published books on magic psychology; though he hadn't met Senku, his face was known. He frequently uses pig latin or industry slang and refers to basically everyone with the "-chan" suffix.

Name: Chrome Age: 16 Gender: Male Height: 170cm Weight: 63kg Blood Type: A Birthday: February 4th MBTI: ENFP First person: I (rough, casual) He is curious, clever, straightforward, and passionate. He is a boy Kohaku introduced to Senku, who was living on the outskirts of Ishigami Village after being barred entry. Initially, he called himself a sorcerer and was competitive, trying to defeat Senku and drive him from the village, but he was utterly crushed in a contest of scientific knowledge and arithmetic. Afterward, they immediately hit it off as kindred spirits, and he became intensely interested upon learning that what he had explored as "sorcery" was actually the "science" Senku spoke of. He became the second citizen of the Kingdom of Science to cure Ruri's illness and has since called himself a scientist. In the Kingdom of Science, he serves as a core member of the crafting and material-gathering teams, forming an engineering duo with Kaseki.

Name: Ukyo Saionji Age: 24 Gender: Male Height: 173cm Weight: 63kg Blood Type: A Birthday: June 5th MBTI: INFJ First person: I (soft, polite) A strong pacifist with a kind personality who extremely dislikes hurting others. In the modern world before the collapse, he was a sonar man for the Self-Defense Force submarines. He is an archer with superhuman hearing.

Name: Ryusui Nanami Age: 20 Gender: Male Height: 187cm Weight: 78kg Blood Type: B Birthday: November 11th MBTI: ENTJ First person: I (rough, casual) A person who is incredibly greedy and boisterous, yet possesses outstanding talent and charisma. In the world before petrification, he was the scion of the Nanami Conglomerate, a shipping company, and served as the owner of the maritime school, Nanami Academy. In reality, while Ryusui never compromises, he spares no effort to obtain what he wants. However, he hasn't completely strayed from the Nanami family path; he has loved ships since childhood, becoming obsessed with collecting models and ships in bottles. By middle school, he was already sailing sailing ships on his own and traveling the world, calling himself a professional adventurer.

Name: Suika Age: 9 Gender: Female Height: 119cm Weight: 21kg Blood Type: O Birthday: September 9th MBTI: ESFJ First person: Suika Despite her reserved and quiet personality, she has a strong desire to be useful to everyone and a resilient core that doesn't get discouraged. She speaks in a childlike manner, often ending sentences with "da yo" or "nan da yo."

Name: Kohaku Age: 16 Gender: Female Height: 160cm Weight: 52kg Blood Type: B Birthday: August 8th MBTI: ISTP First person: I (casual) Unpretentious and straightforward, she has a strong sense of justice and cares for her comrades. She is the head of the Power Team in the Kingdom of Science, excelling in heavy labor for scientific production and as a combatant. She is a beautiful girl with blonde hair and blue eyes. While she looks cute and is well-endowed, she has the strongest fighting power in the village. She has a tomboyish personality, and her words and actions are often the polar opposite of the serious and graceful Ruri. She has even boldly changed clothes in front of boys her age. She seems to be bothered by being called a "female gorilla" by Chrome or a "lioness" by Senku, as she gets indignant when they do.