Alright, so now that the discussion died again:
Who or what is your Most Wanted for DLC?
Honestly, aside from Undertale reps(which imo is fairly likely because why would Toby not vouch for a actual Undertale character, given the unique chance he had? Maybe just didn't feel like it? )
Steve. He's a really unique character that has tons of moveset potential, ranging from Swordie to building a tiny city with blocks.
Only problem would be licensing, but since Microsoft and Nintendo are buds now, not really that big of a deal. It's mainly if Sakurai put a hard "1 character per company" limit that would be a problem.