Greetings all! I have an idea for a game so I'm currently doing some research. 

Context:

So. The game will be a fighter that allows the player to customize their characters all of their "Movez" and swap them out at will (out of combat of course) and allow for custom movesets. This was shown in an old WWE game (smack down vs raw I believe). However, I want to make it so that the community can create  animations for movez/stylez via an in game animation editor. 

I would like to have set parameters to limit animations to not have 'unnatural' movements. 

Questions:

1) What are you thoughts on how thoughts on how to best execute this? 

2) What's the most efficient and user-friendly animation methods. E.G. 2d vs 3d, bone vs mesh vs frame.