Been playing the demo a lot, and is it just me or does Link seem to play way way better than his Brawl counterpart? It's not even that they made a ton of changes to his moveset or anything, but it just seems to flow so much better in this game. He was someone I loathed playing as in Brawl and would avoid at all costs, but he may actually be my favorite to play as in the demo of the 5, which shocks me.
Pikachu and Mario seem pretty similar to their Brawl ones, and Mega Man is really fun while Villager definitely takes some getting used to. He's a bit too recovery based and light on damage for me.