Takao Shimasaki

Takao Shimasaki (嶋崎 崇夫, Shimasaki Takao) is the Kaimei High School baseball club's fourth batter who is questioned as a potential suspect in the "Glass Man" investigation. He views a bat as a weapon used to take down an enemy, and when swinging has the urge to destroy everything in his path.

Manga Debut: Chapter 69 (The Glass Man)
Anime Debut: Episode 33 (The Glass Man)

(source: sketdance.wikia.com)