I could definitely see Ring Fit as a major candidate. Not only because of the parralels to , but also since she's got a new weapon and thus a lot of room for new attacks. Something Sakurai does like to do with newcomers. Also, it's been doing really well, so if Nintendo is indeed going for promotion with its own characters I could see them pushing for RF.Pokemon and Zelda are the only ones that I can see happening. If the 2nd Pack's characters were decided around E3, I can't imagine Metroid getting a character considering Metroid Prime 4 was restarted around last January, making it likely that Metroid Prime 4 was still in concept form around E3. Shield and Sword at least have released recently and Breath of the Wild 2 is coming around, so those 2 are the ones with the biggest chance of getting another character in Season 2.
If Spirits don't affect chances, than the other possibilities are Geno and maybe Elma if they want to advertise Xenoblade X for Switch.
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