Jigoro Kuwajima

Shihan is the alias of the man who trained Agatsuma Zenitsu and Kaigaku. He was formerly a Pillar in the Demon Killing Corps.

Appearance
Shihan mainly appears in the manga through the forms of flashbacks, he can be physically described as a short, elderly man with silver or grey colored hair and a visible scar located below his left eye. He is commonly seen in the manga wearing a jinbei styled kimono similar to the one worn by Sakonji Urokodai.

History
Shihan was the instructor of Zenitsu and Kaigaku.

He committed suicide by seppuku when his former protege defected to gain the powers of a demon.

Quotes

 * (To Agatsuma Zenitsu) "Zenitsu, go the distance. You can run, you can cry, but don't give up. I believe in you. You've endured a hellish training regimen every single day. You will definitely be rewarded. Strike until it's at its limit! Become a blade! That is stronger than anyone else!!"