It's a pretty good masked man alt. There's also one seemingly based on Boney:
And of course, Claus:
(He has others, but they just seem to be recolors)
Might I add that his design in general, like Ness', but even more noticable, is wayyyyy better in this game and much more fitting with the Mother art style. He looked too realistic in Brawl.
Trailer's here: https://www.youtube.com/watch?v=Ny8906RK1do
EDIT: and a better pic of the masked man alt, and the other recolor: