Yeah, exactly. That's my problem with anime-style. Since the characters themselves are too similar due to following the artstyle so closely, they have to rely on having accentuate or exaggerate their clothing or weapons, because the characters themselves aren't distinct enough.
I'm not a fan of Fire Emblem, but I respect it. I'm not saying them or any other jrpg/anime characters are not worthy of Smash representation or anything. I'm just saying that I personally find them uninspired and uninteresting, visually speaking. And therefore I'd prefer other characters over them. It's just my subjective opinion.
About how they play, I agree with
okamifire
, I don't mind ones like Robin or Corrin. As long as they play different enough, I'll enjoy them (I have criticized Ike for the artstyle, but he was actually one of my mains back in Brawl). But having Marth + 3 Pseudo Marths is too much for my taste.