Have you asked your character? No? Then do it. Also look at the answers here, they might help:
http://writers.stackexchange.com/questions/4138/how-do-i-round-out-a-powerful-character
http://writers.stackexchange.com/questions/1832/finding-the-voice-of-a-character
http://writers.stackexchange.com/questions/3560/tips-for-adding-more-personality-to-characters
http://writers.stackexchange.com/questions/2786/how-do-you-make-your-characters-likable
http://writers.stackexchange.com/questions/2974/what-does-character-development-actually-mean