A lot of people are tired of all the Fire Emblem anime sword people running about the SSB roster. I have an idea of how to shake that up without cutting fan-favorite characters.
Ladies and gentlemen I present to you Robin: Festive Tactician
Robin will run around attacking with a Christmas tree and making Christmas related puns. Not only will this add variety to the roster, it will do so without cutting anyone from the roster. It's win-win.
But why stop there? We can take it a step further with Lucina: Spring Exalt
Instead of being a Marth clone, Lucina now attacks with a magic egg. A purely magic-based fighter.
I'm not done though. Roy is a Smash fan-favorite and people were bummed he wasn't in Brawl. Smash 4 brought him back as DLC and did more to differentiate him from Marth but some people feel that wasn't enough; he's still just another anime sword guy.
Our boy now has a bow. Roy: Youthful Gifts!
Speaks for itself, really.
I'm not being serious.