Well, I suppose you do have a point.
Not that it matters much as what constitutes as fan service is highly subjective. The fact Sakurai decided to make DLC in the first place rather than ending development when the game finished back in 2014 could be considered as fan service by itself since it's content that otherwise wouldn't have gotten in otherwise, especially Bayonetta and Corrin, who are based on games that finished development or were in development when Smash 3DS/Wii U was released.
Had that same problem. lol
He's not a FE character, therefore no counter.
I'm already getting used to him. Very fun to play as. I've already cleared Classic on 9.0 on my 3DS as him. His Limit Break is very handy to deal with Master Core and it didn't took me many tries.