There are more chars now. There are at least four vore Yoshis, and a guy on Devianart made two Lucario (Pokemon) edits that use vore. There are others too, but still not many that I'm familiar with.

If you want to download Mugen, go here: http://elecbyte.com/mugen
Keep in mind through all the tutorials that character and stage files don't work in the "rar' format they usually come in. You'll need to convert it first into a "zip" file, which is where this site will come in handy:
www.convertfiles.com
OK! Have fun!