Toughest for me so far: ROB, Ness, Donkey Kong, Mii Sword fighter, Pichu
Need more experience but not looking good so far for me either: Bowser Jr, Little Mac, Fox, Greninja
It’s weird because I think Wolf does better than Fox overall in the game, but I think Fox is strong against Wolf in particular. Like Wolf is better than the other spacies against a majority of the cast, but Fox and Falco seem well equipped to deal with Wolf.
I struggle real hard against Ness and Rob in particular. Rob seems to own neutral, and both Rob and Ness delete Wolfs recovery completely. Ness’s aerials out match Wolfs quite a bit. A good Ness player if he gets Wolf offstage seem to abuse PK thunder to the point of just absolute destruction no matter which of your limited options you try to go with. Donkey Kong you really have to be a master of teching and avoiding being grabbed or else it’s very difficult.
I haven’t had the trouble against Fire Emblem characters online such as Lucina and Roy, but I have no experience with them in person either in friendlies or tournament sets to really say much about them. I played one guy who counter picked Roy after I won the first game against his Samus, and while he killed me very early (Roy’s major advantage in the MU imo), I was still able to dictate the pace of the game and ultimately came out on top.
So far though I’d definitely say I’ve struggled mightily in online smash (elite and not), and in person at tournaments for friendlies and sets against Rob and Ness specifically. I’m not a smash expert or particularly great player tho so take it with a grain of salt lol