Rantaro could be described as a carefree and relaxed person, and he is actually described as one of the more ordinary students despite his mysteriousness, with he himself stating that he can sometimes get a bit overwhelmed by the others' stranger personalities. People occasionally seem to assume that Rantaro is a womanizer, he himself is aware that he looks like a "playboy", but he always insists he isn't that kind of person, causing Tsumugi to believe he is gay.