I'm minorly OCD about my planning and plotting but I love character outlines. Like someone else, I used to (and still somewhat do for fun) online roleplay so character sheets were quite standard.
When I got Scrivener, I was able to transition it over smoothly. At first on word I had several scrap pages with alias' and titles and histories.. now with Scriv it's a lot easier to keep track of everyone. I do basics name, age, personality, description, history, and key/plot elements (alias, number, titles)..