Beforehand, people are using playbys for characters having human forms to switch to. However, the rules and the site admin says having playbys isn't necessary. You're still playing the characters so even if you use one you can switch between human and animated form, and again it's not necessary.
The site is also mostly for animated movies, though the admin also says characters from tv spinoffs of these movies (like aladdin the series) is allowed, and there are some more animation studios and the like than usual on this list. It's a canon-only site, and it's got a very villain-centric plot, but...THOUGHT I'D LINK IT ANYWAY. Also this is a very laid-back site in terms of posting compared to some others. Their minimum is 150 words, but they welcome all levels, so long as you don't overwhelm any of the beginners. And it seems to be working out okay thus far.