He is a transfer student from Kaimei High School.
Not much is known about his past. Based on what happened in episode one, Teppei is a student with not much self esteem and seeks to find somewhere he can belong and seeks friends as well.
Teppei Sugihara, who is created by Kenta Shinohara, has no information regarding any inspiration used to create him. He first appears in Sket Dance volume 1 and episode 1. His Japanese actor is Daisuke Sakaguchi.
Teppei Sugihara transfers to Bossun and the gang's class. Later, Teppei gets confronted by Bossun and his crew. Himeko and Switch perform an act to get him to join Sket Dan. Bossun and his members explain that their club accepts requests from classmates and helps solve their problems. In their request to stop the perpetrator who paints over the school wall, Bossun figures out that Teppei is bullied by Jogasaki by using his concentration ability; Teppei gets caught by Bossun. Teppei reveals that Jogasaki has been bullying him since childhood and that when he enroll at Kaimei High school, he gets bully again by Jogasaki. Upon hearing Teppei's story, Bossun cheers up Teppei, and his crew find Jogasaki and his friends with Hime beating Jogasaki.
After the event, Teppei joins the basketball club.