Enemies
Stage 4 had a good variety, due to the fact it had Mobians. Seemed to be more fitting for this game. These types could be consistent across the game, not totally replacing all enemies we have already of course, fitting a theme for each level, for example:
Stage 1, a Babylonian Mobian, due to the level taking part in the sky.
Stage 2, an Echidna Mobian, similar to Knuckles' tribe, due to it being a dense forest.
Stage 3, an Aquatic Mobian, due to being underwater.
Stage 6, Civilian Mobians, due to taking part in the City/Casino.