Hayate is shown to be a murderous individual in Kougasaki's memories. He loathed Oni so much that he killed his own wife and daughter after finding out they're Oni. He’s an extremist without remorse, viewing Oni as only as nothing more than pests to be exterminated. He’s shown to be callous and with a intolerance to failure, even towards his own subordinates. He’s shown to be stoic and determined. He is the head of the Research Department in the Momotarou Corporation.