I am a terrible actress so I usually play somebody who is a reincarnation or at the very least an extension or exaggeration of myself.

And in real life I am probably the most ugly, alien looking androgynous girl you could find, with a voice that is unusually quiet, low, and while not exactly rough or masculine, it sounds...broken? So I usually play somebody with low self esteem. 

I'm also a bit of a pacifist. It literally pains me to even smack a fly, so I usually play non-violent types or at least heroes that wont kill.

So I usually make any of these character types or a combination of them: shy virgin girl, quiet artist, depressed emo chick, teacher's pet, tree hugger, anime/superhero dork.