Iwamoto  

, 岩本

Mr. Akashi and Mr. Iwamoto are two teachers that Yusuke does not get along with. They dislike him and his friends and try to expel them in every way possible. During the Four Beasts saga, Mr. Iwamoto is infested by a roundworm monster/makai insect. Since Suzaku commanded all of the infected individuals to kill Keiko Yukimura, Iwamoto stalks her around Sarayashiki Junior High School before Yusuke destroys his whistle, causing the insect inside him to die and returning him to normal. Initially, Yusuke tests his spiritual powers by firing his Spirit Gun into Mr. Iwamotos head, knocking him out.