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What is their goal? What drives them as a person?
What is their relationship with their parents?
How was your character's relationship with their siblings? How is it now?
What about their extended family?
Do they have any role models?
What about childhood friends?
Who are their current friends?
How was your character educated?
Does your character have any religious beliefs?
What are their morals?
What's their vocabulary like? What sort of voice do they have?
What are they afraid of? What are their secrets?
If your character could be someone else, who would they be?
What are their vices and virtues?
What is their greatest achievement, and what is their deepest regret?
What three items do they treasure the most?
What upsets them the most? What angers them?
How would a stranger describe them?
How would their friends describe them?
What are the choices they have made that have lead them to their current situation?