I tend to go through phases on what classes and such I play, at first I made nothing but half-elf thieves, etc. Now I pretty much play nothing but human speed-based characters. High dex finesse characters who get many low damage attacks instead of few high damage ones. They also tend to be intelligent, and their personalities change slightly based on events in game. Like one thief I played was a sarcastic happy-go-lucky thief for hire. Then he got dragged to war and died, and was raised. After dying and returning he became a lot more dark and serious, and blamed the person who dragged him to war for his death, and plotted their elaborate downfall.
That thief was my favorite character. His defining moment was robbing a 15th level wizard's tower, with a broken leg, at 8th level. It was really funny watching my DM roll my move silently and hide in shadows checks. He gave me like a 30% penalty to my move silently because I had to hop around on one foot. Passed every time, and his swearing was hilarious. Unfortunately my girlfriend cheated on me with that DM, so I kinda broke off contact and haven't finished the campaign.