From what I have been able to observe, literally everyone tries to create characters outside of plot by outlining what they look like, what they eat for dinner, and what bands they absolutely abhor. That's the law on how it's done. The amount of "character survey sheets" containing a never-ending list of questions for prospective characters is ridiculous--and sad, because determining these things will in no way help you create a good character or, more importantly, a good story (which I define as an account of a character's actions within a given plot).
In reality, your character is not going to comb his hair, sit down to the dinner table, or workout in the gym with his iPod during the erupting mayhem of your story. If he does, it's because you've invested way too much time in randomly select