Good question! Honestly, I don't mind about the specifics, but it has to be at least a paragraph and feature your character. If you're out of ideas, try these ones!
[list]
[*]Day in the life of
[*]Fond/disturbing childhood memory
[*]How they found out about the Resistance
[*]A significant life event
[*]A scuffle with the law
[*]Monologue
[*]Meeting with friends
[/list]

Of course, you aren't limited to these. Write about whatever, it just has to feature your character.