Character biography. Now that you know who's who, here's a template for figuring out how they got to the situation in your novel. When it's time to write a flashback or refer to a past event, you'll breathe easier (and save yourself some edits) knowing you can look up the dates in this simple timeline.
Character profile worksheet. If you want to go deeper with your characters, you'll need a full dossier describing their physical appearance, manner of speaking, behavioral traits, and background. From their hair color to their biggest secret, this questionnaire covers it all.