Xero is the Lord of Chaos so he's extremely unpredictable and erratic. He's close to Noir in various ways. he's known to casually kill people without hesitation and remorse. Xero is very easy to anger in any situation. It's recommended to try your best to not get on his bad side. He doesn't really like Rosè very much due to the fact that she is so calm about her work. Don't ask about his eye, trust me.