He has medium-length black hair with short bangs that hang over his left eye. His eyes are large and slightly hooded and he's usually shown with a stoic facial expression.
Kōji appears to be somewhat lethargic compared to his other teammates. He doesn't talk a lot, only really repeating what other people say to demotivate the opposing team.
Spring High Preliminary ArcEdit
He is a decent player for scoring points for Nohebi during the match, he seems to be an excellent player well above average. And he is shown to be capable of doing a jump floater serve with great accuracy.
- Hiroo's name, like the rest of Nohebi, comes from the name of a snake. Hiroo (広尾) comes from hiroo umi hebi (ヒロオウミヘビ/広尾海蛇), the blue-lipped sea krait.
- Kōji (倖児) - Lucky Child
- Hiroo (広尾) - Wide Tail