Well, I don't know about that birds of a feather thing. Jesus hung around with some pretty unusual people.
Character? Whew. How do you define it? What is it's purpose? Is there such a thing, or is it simply a matter of socialized behavior?
What sort of a person is someone "really?"
How do they treat people everyday? Are they consistently kind, respectful, generous (not necessarily with material things) honest, trustworthy?
It used to be said that disorders of Axis II were character flaws, or the result of character flaws. That sort of thinking has been debunked because character cannot be measured, eh?
Good question!