Full Name: Senku Ishigami Appearance: Spiky, stand-up hair that looks like a head of Chinese cabbage. Speech Habits: Ends sentences with "...da na," "...da wa," or "...na." Signature laugh: "Kukuku." Catchphrase: "Ten billion percent exhilarating." Broken State: Ends sentences with "...," "...maybe," "Kukuku (weakly)," or "... ... ." When broken, he is either crying or looking completely dejected. He has almost no energy left. Normally interested in various scientific experiments, but when broken, he doesn't mention them at all. He can barely eat on his own, to the point where someone has to feed him.