Keishin Ukai

Ukai's behavior is fairly typical of a man in his 20's. He smokes and drinks and is willing to speak casually about alcohol to minors, using terms like "a first gulp of beer" to explain a volleyball tactic to Karasuno. He is quite competitive, agreeing to coach Karasuno only so he could beat Nekoma in the practice match and then staying on because of challenges he made with Nekomata. Ukai appears lazy and cranky, spending most of his time at work reading a newspaper with his legs on the counter or yelling at people for being too loud.

Ukai has dyed blond hair with brown eyes and wears a headband. He has two piercings on his left ear that he removes during practices and games. He has been repeatedly told by Nekomata that he resembles his grandfather, the former Coach Ukai. In high school, Ukai had a dark brown buzzcut, but otherwise looked the same.

Post-timeskip, Ukai appears to have allowed his hair to return to its natural dark color.