These questions are all directed toward your character to see their opinions and worldview - and what in the world they have seen! The more you say, the more I have to work with, but if you don't have much to say, that's okay, too. These are just to get you thinking about it, not to make you uncomfortable in any way.

1) Why do you adventure? If you weren't an adventurer, what would you do? Is this your first adventure? What do you think of the non-adventuring life of most people?
2) Do you have any nicknames? Did you have any while growing up? Why were you given these nicknames?
3) What inspires your choice of clothing?
4) Where were you born? Where did you grow up? Where do you live now? (keep in mind, you're making up places for this)
5) Who were your parents - do you even know? Are they still alive? If not, what became of them? If so, do you get along with them? Are you yourself a parent? Have you ever been? Are you married?
6) What training do you have? Were you an apprentice? A student? Self-taught? When and how did you first learn you could do what you do?
7) What other jobs have you had?
8) What are the important moments of your life? (As in like the "where were you when JFK was shot/the towers fell/whatever other major events there have been" type of moments, both good and bad)
9) Do you have any likes? Dislikes? Hobbies? Goals? Especially goals. Have they changed over the years?
10) Who/what is your most valued person? Possession? Concept? Have they changed over the years?
11) Why are you that alignment?
12) Is there a line you won't cross, no matter what? Things like "I'll kill people, but only if they deserve it" or "I'll never kill a child, even if they're responsible for the deaths of hundreds, or possessed by a demon."
13) What is your greatest fear? What would make you happiest?
14) What is your stance on the new technologies of clockwork and firearms?

If you want your character to be world famous, with all their history well-known, I guess you can share the answers publicly, but I don't expect that. PMing lets it be a surprise to the group, and trust me, the answers I've gotten so far are AMAZING, and will be so much fun. Even when they didn't have much in them, and didn't answer all the questions, the answers added SO MUCH to the story. Seriously, you can answer one question with one sentence and still help out a lot. The more you have, the more I have to work with to make this more fun for you and get a feel for what you want in the game.