Actually he's using his Hero class from radiant dawn in Smash 4, Vanguard is the upgraded class from that game for Ike.
But yeah I'm kind of turn between Eliwood Roy and this Leaf Roy, I'm like a huge fan of knights and armor so that's why I like the Leaf Idea, but at the same time I feel Eliwood dressed Roy would fit better with Roy since both he and his dad have the same hair and clothing color plus they're related and would be like playing as Eliwood since they'd look so similar. :D
But as I've said before for Ike I'd hope to see Lord class for him, It's my favorite appearance of his and at the same time It's almost the exact same outfit as his father Grail wears, perhaps even making it the one his father actually wears to make it slightly more different from Ike's original costume and having an even larger nod towards Grail then the plain Lord outfit, then if people like (or if the person making the Alt is nice enough to do) they could make recolors to make it plain Lord class if they'd like.
Anyway's I'm hoping that they decide on giving the the Samus kind of treatment and give them more then one alt, then we could have both Leaf and Eliwood Roy, Awakening and Lord class Ike, as well as another alt for Marth.