The Ultimate Tennis Pro. Ryoma is a hard-boiled dandy character. Though he looks like a child, it's been said that his life experience would put an adult to shame. He has a coolness that common high school students don't have, heightened by his very deep, mature voice. He is the calmest, most composed, and unperturbed person in The Killing Game. He isn't shaken by murders nor even if he is personally harmed. After killing a mafia organization with his own hands, Ryoma considers himself a killer, the kind of person other people should not get close to. While generally not appearing very aggressive, he is willing to harm and even kill people if he believes they deserve it, and he occasionally gives others a very piercing look as a warning. Ryoma tends to push other people away. He feels others shouldn't get close to him, because along with being a murderer he is on death row and thus likely to die soon, which would cause his close ones emotional burden. Due to his past, Ryoma appears to be depressed and suicidal, assuming he has very little time left and is unable to have any close ones. He has little regard, if any at all, for his own life.