"One of the youngest members of a motorcycle gang led by his best friend, Shotaro Kaneda, he initially has problems with being seen as little more than an inexperienced "junior" member, weak and introverted. Kaneda is his lifelong best friend. He is perceived both by himself and others, somewhat, as a runt, though this is not necessarily a correct assessment of his character. His misdirected views and intentions constantly lead to conflict with all the other characters and he is stubborn and naive about the consequences of his actions. He is enthusiastic about motorbiking, but can't seem to 'catch up' to his friends much of the time.

Throughout the story, he reflects more openly on feeling bossed around by others, and begins exhibiting an inferiority complex. It is only when he is injured and later incarcerated by the government that he is left helpless and on his own, and begins to take on a corrupt and arrogant attitude, absorbed in his new powers as a result." - From the WIki