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i'd do little combining robots. closer to robopon than pokémon i guess. that way you'd have lots of options by mixing heads/ torso/ feet from a relatively small pool of designs.
you'd be able to change their colors and stick some decals on so it wouldn't look like an awful mishmash.
gameplay would be a mega man battle network style where you have a small grid and roughly 10 second turns. after each turn you can switch out. each bot would have very low MP but it would recharge when they're not active to encourage regular switching.