William School is a young elite member of the Blue Sky Organization & former member of the 3WA (World Wide Wing Association), a loser at that time who left the organization due to his animosity towards it's top agent Michael Frost who never respected him. He is the current user of the Cross System, working as a bounty hunter by capturing criminals & taking a button from them as a memento. He originally had an intense hatred towards Vampire King due to what he heard of the previous one, intending to kill him until he learns of Vampire King's true identity & sees him as an ally to mankind. He also has a belief in "humanity's full potential", which gives him the impression of a superiority complex to some people with the ideal that he's always right. He has a prejudice for certain people like