Depends on what i'm feeling up to at the moment. Some time ago I had a dragon theme earlier cuz I was in a dragon-ish mood. Right now, my likeness for Typhlosion/Houndoom/Arcanine was rekindled so i'm currently doing those.
Yo. I like your avatar, now that I think about it. It's the coloring. Where'd you get that? Also, your profile pic is pretty cool, too (though it doesn't look like a Pokemon anymore and instead it's just... something from any series).
Kind of all over the place. Some of it in school, some of it in non academic classes, most of it just by observation, some by professional illustrators and animators who take the time to teach, some of it from how to draw books.
My own personal style is like a mash of everything I've been inspired by, and the way I eventually wanted to draw. I used to draw in a more on (official) model sort of way, especially when it came to Pokemon, but that bored me to death. I've found that by drawing them in a way that I really enjoy, I really like the way the works come out, too. I'm mostly inspired by art styles from the 1920s and some such, which is probably my biggest influence.