I'm conflicted.
First, It's great to see more females represented in Smash. As someone who chose to play as a female in FE: Awakening, I'm particularly happy to see the inclusion of female 'Robin'.
While I've only played 3 of the Fire Emblem games, I now consider myself a fan of the series, and am happy that it's getting represented.
On the other hand, I really don't need this much Fire Emblem in Smash. I always thought the FE characters in Smash were too similar and, honestly, a little boring. So the thought of having Ike, Marth, Chrom, and Lucina, all sword-wielders, seems like overkill. At least 'Robin' seems to be bringing something Unique with his/her Tomes.
It's a bummer, because Fire Emblem's characters are actually pretty diverse. I'd have loved to see a Cavalry character on horseback like Frederick, an archer like Virion, or a Axe-wielder like Reyn...I mean Vaike. Or better yet, throw a shape-shifting rabbit in there.