His characteristic feature is that he is almost always happy and smiling, but in some situations, he uses his happiness as a form of sarcasm against someone, this is another fixed characteristic of Oikawa: provoking to the point of seeming childish. He also cares a lot about his status, aesthetics, intelligence and abilities, which is why he tends to feel superior to anyone. Tōru Oikawa proves to be quite calm and intellectual, however, he can change completely when it comes to his passion.