I've seen this challenge on one forum or the other, I can't remember where but I liked it. It's a good way to get into your character's head. It goes like this:
Come up with 5 interview questions. The next poster has to answer the questions as if their MC is the one being interviewed. Then they come up with 5 different questions for the next poster.
So, if anyone is game here's the first 5 questions.
1. What motivates you to get out of bed each day?
2. Are you married, or have any love interests?
3. What is your worst fear?
4. What is your favorite memory?
5. What is your greatest weakness?