Zero’s personality is very eccentric and semi-angry, he’s always frowning and seems to only think of killing Roc Hijoushiki. He has a bad temper but doesn’t insult people, but gets annoyed and sometimes will warn or slightly threaten people. When getting absolutely beaten, he starts to quietly sob, not being able to take the pain in anguish and fear. He’s always wanting to be tough. But, he becomes a crying mess when he is at his limit, he’s an angel working under Fumus, the god of Kumo no Kuni.