Ryusui Nanami ↓Before turning into a baby Birthday: November 11th Age: 20 years old Height: 187cm Weight: 78kg Blood Type: B Likes: Everything Catchphrase: "Ha-ha!!" A muscular young man with blond hair leaning towards light brown and sanpaku eyes. His eyebrows are split at the base, resembling an anchor, with the ends neatly divided upward and downward. A magnanimous and charismatic person with a bold, open-hearted personality. While he shows the most intense emotions in the series, he is also very composed and has never been truly enraged. Like Senku and Taiju, there are depictions suggesting he remained conscious during petrification. He is a self-confident egoist and a supporter of vested interests who declares, "The world is mine." Because of this, he isn't exactly a "nice guy" and generally maintains a high-handed attitude. Due to his confidence, he is proud of the body he built through effort and shows no shame even when naked. He believes every woman in the world is beautiful.

SAI Nanami The young master of the Nanami Conglomerate and Ryusui Nanami's older brother. SAI is half-Japanese and half-Indian, and his appearance has different characteristics from his younger brother, Ryusui. He is tall at 181cm with dark brown hair. He has more chiseled features than Ryusui. His real name is "Sai Nanami," but in the series, it is exclusively written as "SAI." A mathematical genius and brilliant programmer described as having the "brain of a million people." Born to a Japanese father and an Indian mother, he showed high talent for mathematics from early childhood, to the point where Ryusui as a baby instinctively said "Wwant!!" (I want him!!). Because of this, he was raised to be an actuary for the Nanami Conglomerate, but since he loved creating game programs, he fled to a Nanami Conglomerate university in India as a math lecturer. During his free time, he always goes to a place where he can be alone with good reception to program. He is known for screaming "Pigyaaa!" when startled. After being revived, he has crack marks on his body like other survivors, but since SAI's forearms weathered during petrification, the area from his fingertips to below his elbows is weathered pitch black.

Height: 160cm, gender unknown. The butler and chef who is always serving at Ryusui Nanami's side. Maintains an elegant demeanor and addresses everyone with the honorific "-sama." Possesses a wide range of skills including English, French, housekeeping, and babysitting. Calm and collected, never showing fatigue or emotion.