Kazuichi is a highly emotional character, though he tries to play it smooth and acts carefree at first. He is a very jumpy person, easily scared and often screaming in fear. People tend to note his intimidating appearance does not match his compulsive and cowardly personality. Naturally, he has a great fear of dying on the island, which causes a lot of stress and panic for him. Kazuichi has a tendency to neglect his need for a verbal filter and often blurts things out without thinking. He also seems to be a very bad liar, leading him to be contradictory at times. While he is a genius with machinery, he appears to be a bit slow-witted otherwise.