I spent a long time feeling regret and contempt for my past actions. I've also been told I'm hard on myself. I'm a Keyblade Master now, and I'll always protect my friends... which works best when I'm focused and goal-oriented.
If you're talking to me, be ready for my deadpan snark. I save most of my sarcasm for villains like the Organization. Though, I can be a pretty nice guy to the people I care about, like Kairi and Mickey—and Sora, Donald and Goofy, even if they are a bunch of wise guys.