Regarding Pokemon and Fire Emblem, here are my current priorities:
Pokemon:
: There’s not much to say besides it being the pokemon mascot.
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as a last resort): I think there’s value to Pokemon Trainer in terms of both gameplay and representing pokemon, and I think their chances are underrated. Pokemon Trainer is one of the only two transforming fighters in Ultimate, which is pretty unique on its own. Also, Pokemon Trainer represents multiple things, such as evolution lines, pokemon typings, and the trainer themselves. While they were cut in SSBFor because of 3DS limitations, I think my points above would help make them a higher priority on the roster, and I feel like solo Charizard would be a time constraint based last resort.
After Pikachu and Pokemon Trainer/Charizard, this is where priorties tend to get blurrier.
: I have Lucario as the next veteran more or less because it’s a popular pokemon since Gen IV, and it seemed to be a high priority going into SSBFor after being promoted to a starter character.
: While Mewtwo would be the third/fifth Kanto pokemon depending on how much you value Pokemon Trainer, I think that Mewtwo is valued more than Greninja. While it was cut from Brawl, this was a highly requested fighter going into SSBFor, and it remains popular today.
: Popular pokemon who more or less has to compete with the other four/six fighters above.
: The main things going for it are SSB history and ease of development at this point. While it was low priority in Brawl and For, I can still see it squeak by, potentially over Greninja and/or Mewtwo.
: This is a notable pokemon, but I feel like it’s popular than the ones above barring potentially Jigglypuff, and I guess this may be me just saying to axe the new ones first to some degree.
: I feel like this is one of those characters who will only remain because of everyone is here.
Fire Emblem:
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: Marth is the poster child of Fire Emblem, and I think that they’ll try to bring echoes back with their parent, so that’s why Lucina is here.
: I flip flop between Ike and Robin as they both contribute important factors that differ from each other. Ike is the more popular character, has more history than Robin in SSB, and provides a heavy swordfighter.
: In contrast to Ike, Robin provides an Avatar, a protagonist from Fire Emblem’s Renaissance game, and a unique gameplay mechanic in the form of weapon durability.
: Three Houses is an important game, but Byleth’s intial mixed reception puts them lower for me, and I think the other four fighters above have some good justifications to stay.
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: Roy is well liked in the SSB Community, Chrom was requested going into Ultimate, but Byleth’s points still apply here.
: Outside of Piranha Plant, Corrin is probably the lowest priority in terms of unique fighters given the divisive nature of the character.