Hayato Juumonji

Class 2-C's co-homeroom teacher, a specialist in reforming misguided students. Juumonji Hayato and Araki Gota is actually the same person. His assigned number in Kamen Teacher organization is 10. He has a partner whom he calls Kusanagi-san. In the last chapter it turns out that Gota and Kusanagi were delinquents at school as well before joining Kamen Teacher program.

In Kamen Teacher Black, Araki Gouta isn't Juumonji.