The Harbinger of Ferocity and Ellri have the right idea. If you want to make an "in depth" bio, the best thing to do is not mention too many fine details. Depth is kind of weird, because what most people describe as depth is something that is difficult or impossible to entirely know. That goes for your bio and even how your characters act IC. While you're add it, try writing down a few odd quirks. Maybe your character slaps the frame of a door before walking through it, or draws butterflies in the dirt outside wherever they plan on sleeping. Details like that will keep readers guessing until you plan on explaining them.

Also, lool @ Arlene's article. Replacing adverbs with different adverbs doesn't make dialog exciting. and will people stop vilifying info dumps already?