0 has never had a personality to me, though if you really asked me to come up with something, I'd be forced to say that he would be a god of sorts, some celestial being who noone knows, who no one's even sure exists. No personality, just... does that make sense?
Sorry if I'm not making any sense. It's best to describe it as whenever I see or think about a number or number sentence, it's like that number is in my mind, as a person, doing a certain thing. 6 is bringing gifts to 9. 5 is beating up 8. Like a little mini play in my head that no one else can see.