Utsuro

Utsuro is the founder of the Tendoshu and was also the first leader of the Naraku Faction before Oboro.

It is later revealed in the Battle for Rakuyo Arc that Utsuro is actually Shouyou Yoshida, Gintoki's former teacher. After Shouyou was killed by Gintoki, the persona inside of Utsuro known as Shouyou died, allowing the Utsuro personality to take full control of the body.