Torimaru

Kyousuke Karasuma is an A-Class agent, member of Tamakoma Branch and Osamu and Ai's mentor. He's a member of the Team Tamakoma First. Kyousuke likes to tease Kirie and makes fun of her. He also likes to make jokes, just so he could get Kirie confused. He is also quite responsible and, as stated by Jin, "He is a good teacher."

(Source: World Trigger Wikia)