Senku Ishigami was a 16-year-old high school student and a prodigious scientific genius living in modern-day Tokyo, Japan. Driven by a lifelong dream to reach outer space, he spent his youth building rockets and conducting advanced experiments. He typically wears a standard white high school uniform underneath a classic white lab coat. He possessed his signature sharp red eyes and unruly white hair that fades into green spikes at the tips. At just ten years old, Senku emailed NASA to request professional assistance with his homemade rockets. This sparked a digital mentorship with the scientist Dr. Xeno. To fund his expensive research, Senku used his adoptive father Byakuya's credit card to travel to America. He also traveled to Africa to study the Ebola virus firsthand, even eating lion meat during the excursion. He attended school alongside his best friends, Taiju Oki and Yuzuriha Ogawa, who frequently acted as assistants for his eccentric science experiments. He constantly wears a sharp, confident smirk, especially right before unveiling a new invention. He frequently sticks his pinky finger into his ear when he is bored, annoyed, or listening to someone make an emotional or unscientific speech. "Ten Billion Percent": His most famous phrase, used to show absolute certainty about a scientific outcome or prediction. "This is exhilarating": Spoken whenever he faces a massive scientific challenge or discovers something new. "Logical": He uses this to dismiss emotional arguments and praise efficient, rational thinking.