Gender

Race (optional, and as in: human, demon, werewolf, etc.)

Age

Where they live (and if they live with someone, who)

Occupation (if they have one)

How they spend free time

3-4 words to describe their personality

Sexuality (another optional one. Not needed if all your characters are straight, but I find that boring soo...)

Goal (getting into college, Medical PhD, saving the world, finding love, etc.)

Thought this might help some people who need it. Of course, you can add or remove ones as you need, but this is how I'm personally doing it for planning a fun series that's saved for the distant future.