Kezuka

Kezuka (手塚) is the advisor for Kaimei High School's two manga clubs. When Roman and Magata get into an argument over whether shōjo or shōnen manga is better, he appears to point out the good points of both types. Putting an emphasis on story rather than genre, he challenges each of them to create a short manga based on a topic of his choosing - and ends up choosing Roman's as the winner.

Manga Debut: Chapter 156 (The Road Roman Takes)
Anime Debut: Episode 73 (The Time I Fully Came to Know Peeping...)

(source: SKET Dance Wikia)