Iwaizumi Hajime is 23 years old and is the athletic trainer for the Japanese National volleyball team. Iwaizumi is about 6'1 and has a muscular build and broad shoulders. He has dark brown, spiky, short hair with olive green eyes. He is half Filipino and half Japanese. Iwaizumi is a very no nonsense, down to earth guy who tends to be quite straight forward. He is firm-yet-caring and quite protective, especially over Oikawa. He is 'the top' in their relationship and in the bedroom.