Can't think of a word.

[rbnyc]

I've been to the thesaurus. I just can’t think of a word I’m sure I’ve used hundreds of times.

What is a word to describe a person who has contradicting characteristics? Not, hypocritical, but more dualistic. (But that’s not the word I can't remember. It’s also not dichotomous.) I know I’ve used this word before to describe a person I know who can be very mean and selfish and also very thoughtful, kind and generous. I know everyone has the capacity for both things, but in her these qualities are very sharp – the contrast defines her. There’s a word for a person who is defined by their contrasting, polar qualities. What is it?

Help!

A side note: May own contradicting qualities: I suffer from both an inferiority complex and delusions of grandeur. Also, I can be very frugal and very frivolous in my spending.

Edit: I meant to ask, what are your most outstanding polar qualaties?