 He is also an experienced martial artist, as Onizuka is capable of fending off multiple opponents, even if they are well-armed.However, it was revealed around chapter 190 that because of all the physical damage he sustained since he started teaching, it resulted in a clotted blood vessel in his brain, and that a jolt to his head could either turn him into a vegetable, paralyze him, or kill him.In spite of his impressive fighting skills, Onizuka is often roughed up by his students, and others, whenever he behaves badly.