I'm probably going to sound like an asshole for saying this but since Smash 4, I'm avoiding Fire Emblem like the plague. My most disliked are "Female Marth", "Fire Marth" and "Sir Advertisement" specifically. :/ Literally the only unique FE character in Smash I've seen is Robin, as they don't have a counter. Blame me for not liking many RPG's beside Pokémon, Paper Mario and Mario & Luigi if you must, My opinion. :U
Also out of unpopular opinion: I actually like Starlow, personally. Sure she can be kind of a dick to Luigi, but I doubt she really means it... (Dream Team had a scene where she cares for him when he freezes on Mount Pajama.) Plus she's just kinda cute.