Haiji is deliberate and calculating, although others might call him cowardly. He is very paranoid about the Resistance's hideout, not allowing anyone to leave the place. He claims he isn't hiding, but simply waiting for the right opportunity, although he later admits that he was just being a coward and states that he probably isn't a very good leader.

He is rather serious, the one time he tries to joke around being an awkward and tone-deaf joke about Nagisa's trauma a moment after the child's s