... things like this make me think of Donkey Kong Country and just how incredible it was for the SNES. I've always felt that something similar could have been done on the Jaguar, just not at the time due to the rendering requirements involved. Things have changed... and with TRF being in the light again and realizing how easy fighting games could be with rendered scenes, making up a slew of characters with various animations could be done very quickly and easily. Take this scene for example in a jungle like setting:
Then I feel characters like this could fill the scene (the red area is panning space left and right)
Not really sure what you could do with a 6MB ROM with this sort of thing, but I imagine it would have to be an extremely limited amount of characters and/or scenes if that were the case. Going the JagCD route would almost be mandatory in a sense or maybe a combination thereof utilizing both 6MB cart for character data/assets and Jaguar CD to load backdrops and other scenes that aren't required to be loaded so much in realtime.
and just to show what the original character I started out with looks like in hi-res: