DongShenYin said:
As a GM of a more storytelling bent, I want my players to create a compelling, full-of-plothooks characters. However, I want to help them more than just saying, "Write up three paragraphs of your character's backstory" What sort of questions should I have the players think about that would help them along?
Weeeeell.......
If you want compelling, full-of-plothooks, I'd say maybe a page or two minimum....?
But each to their own. I realise this wouldn't suit a lot of people, and it's not necessarily
better than writing less background; it's just what I prefer as GM or as player,
ideally that is. And not everybody wishes to write prose or anything that approaches it warily from a great distance, for that matter. Understandably too.
I'm not sure what you already would have covered, so I don't know what specifically to suggest. Of course, 'the basics' is the place to start : P.O.B, age, general circumstances surrounding conception and birth and early childhood, family members originally, family members now - including the extendeds and in-laws etc., friends past and/or present, lovers past and/or present, enemies past and/or present, other social ties past and present, general outlook past and present, likes, dislikes, loves, hates, hopes, fears, feelings about various iffy or touchy subjects (such as sanctity of life, vengeance, politics, religion, personal rights and freedoms etc....), personal strengths, personal weaknesses, PC's perception of self, others' perceptions of PC, physical description, distinctive features, clothing and style..........
Well, I'm not working from a list, so that could go on for a while.

I'll shut myself up there.
Once those points above are addressed, there's room for a lot more detailed and possibly difficult questions to be answered, but really.....how appealing would that task be in general? Hrm. Not overly, I'm thinking.