I take it you didn't read about Quirks and Flaws? Because unlike 4E this is a mechanical system that encourages you to take such personality aspects and role play. So it strongly encourages you to role play. So does the Honor system. So you may want to read the PDF again.
Actually, that's my whole beef: the Honor system. It's incredibly restrictive. A thief must "look out for number one" or lose honor. Yes, you are dishonorable if you help your allies. Plus, you must strictly follow every bit of your incredibly vague alignment, which each person interprets differently. Quirks are basically adjectives you can add to your character that force you to play a certain way, and often godmods your character. I like flaws, though.