Shinichiro Isumi, Hikaru no Go Wiki

Shinichirō Isumi (伊角慎一郎, Isumi Shin'ichirō) is a friend of Hikaru and one of the oldest Insei before he quit after failing the Pro Exam for the 4th Time. However he finally passed and become 1 Dan Player after training at the Chinese Go Assocition. Isumi is often considered too sweet and lacking in backbone, but he is generally polite and treats everyone with normal behavior and respect. There was only one instance where he talked back to someone, Ochi, who had berated him for losing three games

Hikaru no Go #20 - Yashiro vs Hikaru (Issue)

Hikaru no Go Wiki

waya yoshitaka and isumi shin'ichirou (hikaru no go) drawn by komeo15

Hikaru Shindo, Hikaru no Go Wiki

Tetsuo Kaga, Hikaru no Go Wiki

Shinichiro Isumi - Wallpaper and Scan Gallery - Minitokyo

Isumi Shinichiro - Hikaru no Go - Zerochan Anime Image Board

Isumi Shinichiro - Hikaru no Go - Zerochan Anime Image Board

Hikaru no Go (2001)

waya yoshitaka and isumi shin'ichirou (hikaru no go) drawn by komeo15

Hikaru no Go (Hikaru's Go), Male page 7 - Zerochan Anime Image Board