Hey, so this is cross-posted from a Topic I made on Gamefaqs, but I think it could be interesting for Speculation
it Involves the Absence of Undertale Spirits, enjoy
Theory: Why Undertale spirits are missing, and what it might suggest...
Both Sans and Cuphead were both Premium Mii Costumes that came with Music, and are from Indie developers
However, Cuphead got Spirits shortly after it's release, but even now Undertale still doesn't have any Spirits. Here's 3 conclusions that I made for why this might be a thing
Undertale Spirits either weren't allowed, or weren't able to be Implemented
Toby seems to be lax with the Undertale content if Sans was any indication, but perhaps He didn't want Spirits of the Undertale characters because it might ruin the image of the game or something like that
I Imagine that Nintendo/Sakurai wouldn't not care about Undertale spirits considering that they made Spirits for Cuphead, and Undertale is more of a phenomenon in Japan and such and honestly has a more beloeved supporting cast, so if Undertale Spirits were completely absent by the time DLC is done, it was probably on Toby's part
Another Undertale Mii Costume is coming
They may save the event for after ALL the Undertale costumes are released, which would imply that Sans is not the only Undertale Mii Costume that is coming
They may have intially focused on Sans back when FP1 was the only Pass in Production, but with FP2 being greenlit later on, there could be an additional Undertale mii costume. Perhaps Frisk, Kris, or any of the Supporting characters from Undertale/Deltarune
What this might also suggest, considering the fact that we only have 2 characters left, and there by 2 Mii Costume waves, is that perhaps this might also suggest that one of these Mii Packs might have heavy substantial Indie content, Especially if you find the idea of other Indie characters like Shovel Knight or Hollow Knight getting content in this FP2. this might also suggest one of the last fighters is an Indie character. Speaking of which
Undertale might be getting a Full fighter in FP2
With the fact that Sans was added as a Mii in the 3rd pack of FP1, which is also when Extra DLC was announced (and also greenlit months before), If an Undertale character was in FP2, it would probably be one of the last, if not the last character to be added into the Pass, perhaps as a result of the Amazing reaction the Sans Mii Costume got. This would also explain why FP2 has 6 characters instead of 5
that would mean an Undertale character would have to be decided in 2 months. Perhaps when discussing Sans as a Mii, there were also talks about what a Playable Undertale character would play like. if this scenario were to take place, that would have to be how it happen since 2 Months is not alot of time to negotiate all the details of a Full Fighter in Smash, even with Indie companies
In any case, what Scenario do you think might be happening here?