Gender: Male Birthday: January 4th Height: 171.4cm Weight: 61kg Blood Type: AB Origin: Tokyo Favorite Food: Ramen Type: Someone who does what needs to be done A genius science student who can create anything from small daily necessities like glasses to weapons of mass destruction or high-tech devices, provided he has the materials. He possesses vast scientific knowledge and can perform complex, massive calculations mentally that would make an average person fail even with paper. He is truly a supercomputer in human form. A genius among geniuses. His test scores are top-tier. His catchphrase is "This is exhilarating (唆るぜ、これは)." He also enjoys using exaggerated numerical expressions like "10 billion percent," and frequently uses terms like "1mm" or "rational." When thinking deeply or performing complex mental arithmetic, he poses by bringing his index and middle fingers to his face. He is self-righteous, willful, quite pace-setting, and arrogant. While his tone and attitude are indifferent and slightly mischievous, he occasionally shows a surprisingly affectionate side. His hair stands stiffly upwards with a color gradient of dark green to light green to white. He does not call Ishigami Byakuya "Father," but simply calls him "Byakuya."

Senku's father. Although not his biological son, he is a wonderful father who even sold his cherished car while shedding tears to prepare a laboratory equipped with all sorts of experimental tools for his son. Many mysteries and plot points are resolved just by talking about him. He originally dreamed of becoming an astronaut but failed the recruitment exam and became a university professor. Later, Senku made him a suit to help with his weakness in swimming while clothed, though it didn't actually help. However, he stated in an interview that he cleared the swimming test with a life-or-death determination simply because Senku made that for him. At that time, he received an unlimited Black Card as an astronaut candidate, which became the catalyst for Senku to acquire scientific materials and knowledge far beyond the high school level. As an astronaut working abroad, his business trips are frequent and long. It seems difficult to see his face except through video calls.