In terms of Rayman's moveset, I have some ideas that I'd like to share.
You know how when Rayman launches a forward kick in Legends and Origins, you can follow it up with more attacks? I was thinking his front aerial could either be like Fox's forward aerial or it could function exactly like it does in Legends.
This may not be true to the character, but you know how you could power your lums in Rayman 2 by getting golden hands? I was thinking that in Smash Bros, it would function similarly to Lucario's aura in that as his percentage increased, the power of his lums would do the same. When he gets to, say, 200 percent, Rayman would be able to unleash the most powerful lums from Rayman 2.
Rayman could also have a gimmick in that after he does his dash attack from Legends, he could either slide or, by using the attack button and holding down the control stick shortly after his dash attack, could perform a cartwheel (just like in Legends).
Those are my ideas. What do you guys think?