Teacher at Shokason Juku. Uses polite language. First person: I (polite). Kind, but occasionally terrifying. Gintoki -> Gintoki Takasugi -> Shinsuke Katsura -> Kotaro

Student at Shokason Juku. Often dozes off during class. Always getting a fist to the head from Shoyo. Shoyo -> Shoyo Takasugi -> Takasugi Katsura -> Zura

Student at Shokason Juku. A bit short-tempered. Occasionally gets a fist to the head from Shoyo. Shoyo -> Shoyo-sensei Gintoki -> Gintoki, Perm-head Katsura -> Zura

Student at Shokason Juku. Surprisingly serious. Very rarely gets a fist to the head from Shoyo. Shoyo -> Shoyo-sensei Gintoki -> Gintoki Takasugi -> Takasugi