the bare essentials... :D History: Give a full accounting of your character's history as it pertains to this AU setting. In the case of canon characters, include any important adaptations, reimaginings or changes from their canon history. (This should be the lengthiest section.)
Personality: Describe your character's personality in a few short paragraphs.
Abilities: Describe your character's powers and limitations in one or a few short paragraphs.
Other: Feel free to add anything else following this same format.
Or grab handy format here:
Note: Updated 08/21/2011 to convert base format into table for margin issues with some layouts.