Sergeant Pepper directs the "Aikatsu boot camp" on an uninhabited island, where aspiring Idols who have difficulties in their performances are brought up to speed. The camp has a reputation for being incredibly hard The accent of the instructor reveals he is from America. He also operates a normal boot camp, in which Ichigo Hoshimiya participated in during her one-year stay in America.
His name is a play on Sgt. Pepper's Lonely Hearts Club Band, an album released by The Beatles