jinn (housamo)

"He is a smoke genie Transient who works at Shinjuku Academy as the assistant teacher of your class. He wears a tracksuit and carries around a bamboo sword to discipline students. He is usually carefree and allows his students freedom of spirit as well. His fellow teacher, Mr. Triton, is very particular about the school rules so they don't get along. On the other hand, he sees Mr. Mononobe as the ideal teacher."

tokyo afterschool summoners
https://housamo.wiki/Jinn#transient0