I had an idea that a lot of people seem to really dislike over on GameFAQs if they ever decided to start fresh and reboot the series. It seems pretty controversial but I might as well share it here and see what you guys think.
Assuming the next Smash reboots the series, I think a cool idea for Fire Emblem representation is to have a series of Hero or Bowser Jr. type characters based on weapon types or classes instead of focusing on just going with a separate character for the lord of each game. So basically, for example, we could have a sword Hero, a spear Hero, and an axe Hero (and possibly others for mages or archers etc..). Each of these units would have a different character represented for each outfit, similar to the Koopalings. Since most units of the same class in Fire Emblem fight nearly identically, this would allow for a much wider selection of characters and play styles without taking up too much roster space. You can even get a little creative with alts, as Cloud has shown, giving them some different Final Smash attacks, taunts, and voice clips, as long as the gameplay balance remains identical.
The main issue is, to go with this idea, we’d probably have to demote characters with derivative fighting styles like Lucina, Roy, and Chrom would have to be demoted to Marth alts and lose their unique traits. Some exceptions could be made for characters with very unique traits like Corrin that don’t fit neatly into a class. Okay ke wouldn’t work as a Marth moveset either, so he’d have to remain a unique character if we kept him. Same goes for Byleth, assuming any of these three return for a rebooted Smash game.
I feel like Fire Emblem Heroes probably expanded a lot of peoples appreciation for characters beyond just lords and there is actually a good way to represent a lot of these characters while remaining true to their gameplay in their home series. I’ve also personally always been a bigger fan of side characters like Tharja, Rinkah, Petra, Felix, Shamir, Lon’qu, and Lucia than the lords and this solution gives characters like these a chance. Something like this would likely only work if the series was rebooted and might require a lot of cuts to existing Fire Emblem characters in order to not overload the roster with Fire Emblem but I think it’s worth considering.