Hakkai is a friendly, kind of reserved guy, who changed a lot during his childhood. His brother wanted to teach him discipline, so he was constantly put through physical abuse. He only experienced this wrathful perspective, he continued to beat up other kids himself. This attitude was changed by Mitsuya, who showed him the true way of using his strength. Mitsuya developed a calm personality in Hakkai, and their friendship, both in and outside of Toman grew to its fullest.