Tetsuji Chuuma

Age: 33
Birthday: October 23
Gender: Male
Blood Type: B
Height: 175 cm
Weight: 68 kg
Hair: Black
Occupation: Chemistry Teacher
Relatives: Suzu Chuuma (daughter)

Tetsuji Chuuma (中馬 鉄治, Chuuma Tetsuji), more commonly called Chuu-san (チュウさん), 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.
Manga Debut: Chapter 1 (Paint-Mask)
Anime Debut: Episode 1 (The Campus SKET)

Seiyuu:
- Hayato Nakata (Drama CD)
- Jouji Nakata (anime)
- Daisuke Kirii (ep 45, disguised as a high school student)

(Source: Wikia)