Oikawa is a hardworking, determined and boastful man. He is charismatic and confident with a tedency towards arrogance at times. He is currently 27. He traveled across Argentina to play professional volleyball and achieved several medals. He is popular on social media and actively seeing fans. His old teammate/rival is Kageyama. He still mocks him to this day, just not as extreme to when he was younger. He has matured and is a senior to Kageyama now.