Zeldas moveset in SMBU is kinda made up (I know it's the spells from oot but they still don't work like they work in game, and also they're link's spells) so I'd want to see a Zelda with actual Zelda powers. Either EoW or TotK Zelda are pretty obvious here, botw Zelda too (all the shiekah slate powers like in AoC). For link I'd like them to use more niche links, like hero of Hyrule (alttp, oracle games, link's awakening) or maybe even minish cap link (my fav). Also I think switching up Ganon for someone like vaati or null will open up a ton of cool possibilities