|Height||174 cm (5' 8.5")|
|Home town||Miyagi Prefecture|
|Occupation||High School Student (2nd Year)|
|Image gallery (4)|
He has light, ash-brown hair with similarly coloured eyes. He has a medium build.
Haga seems to be a carefree, energetic individual.
He's currently a second year in Tokonami High. He plays as the setter on the boys' volleyball team.
Haga first appears at Tokonami High with his teammates, going over the roster for Interhigh. When he discovers that they're against Karasuno, what he believes is a weak team, he becomes excited at the prospect of finally winning the first round.
The first day of Interhigh, Tokonami faces Karasuno. Haga's surprised that Hinata's a middle blocker while taller players are on the bench. Tokonami's soon overwhelmed by Karasuno and Haga remarks that Karasuno isn't a "fallen champion" at all. When Ikejiri quotes Daichi, Haga quickly agrees and exclaims that even though they're weak, they're not going to give up. However, despite their efforts, they lose the match to Karasuno in the end.
Not much is known about him, but he is a stable setter.
He gets along well with his teammates, especially Tamagawa, who he's usually seen with.
- "Weaklings or no, this is the time to stand strong." (To his team, Chapter 40)