Cartoons and anime series, manga, Kpop, making stuff in general, games, SNACKS (you might have realized MLP isn't on here...I just did too. It's strange, I know).
If you are trying to set a moving GIF as your avatar, you might have to find a way to resize it. If the site resizes it automatically, the movement stops working. The GIF has to be 150 x 150 pixels or smaller.