So I found out about this little gem of a game called EF-12. What it is is a fighting game where you are able to customize everything in it from the fighters move sets and animations, to creating entire fighting arenas.
What is great about it is that it supports Autodesk 3DS max, Maya and blender outputs for the modeling. So if you are a character artist/modeler I think this would be the perfect outlet to test your characters in. Even environmental artists/modelers an get something out of it as well with creating the arenas.
Best part, It is completely free.
Get it here: http://playism-games.com/games/ef12/