At the same time though, FE might be the franchise most affected by cuts and / or compression from Smash 6 onwards. I'm not counting on Smash 6 having a 70+ character roster because I'm presuming A) that they'll "start from scratch" more or less, and B) The devs will probably focus on something else after Ultimate touted such a huge roster of nearly 90 characters (including Echoes). Assuming a 60-70 character Smash 6 roster (as a hypotheoretical example), the only really safe characters would be
and possibly Byleth. I'm going into this presuming that a new FE rep gets added (for a total of 5 FE characters in Smash 6). As for the rest:
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could be folded into Marth (staying as she is, but not taking a slot in the CSS by her own, like one of Ultimate's already existing options) if not outright removed - I'm not sure Nintendo feels a "need" to have 2-3 Awakening characters in the game from Smash 6 and beyond.
doesn't have the luxury of being "fold-able" - see Roy.
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feels kind of wonky. Sure, if the devs feel he's different enough from Marth to warrant a spot he (and Chrom) could return. But he's been put on the backburner before, so he feels like a cut.
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feels difficult to tell. Moveset is a plus, but Corrin could also be an easy "cut" too since Fates has been overshadowed by Awakening (its predecessor) and 3H (successor). The character doesn't strike me as one Nintendo would prioritize with a more limited amount of slots available.