|Relatives||Suzu Chūma (daughter)|
|Manga Debut||Chapter 1|
|Anime Debut||Episode 1|
The Campus SKET
|Seiyū||Hayato Nakata (Drama CD)|
Jōji Nakata (anime)
Tetsuji Chūma (中馬 鉄治, Chūma Tetsuji), more commonly called Chū-san, is a chemistry teacher at Kaimei High School and the homeroom teacher for class 2-C. He is the faculty sponsor for the Sket Dan, a fact he often uses to get them to do things for him. He frequently creates odd potions and explosives which oftentimes backfire. He is currently engaged to Remi.