I actually think we're getting more characters under the "Individual DLC" label like Piranha Plant.
It would include characters from series that don't need any extra content. Notice how the deadline for Fighter's Pass 2 is considerably farther out than Pass 1's was. From launch date to February 2020 was 13 months; and from Byleth's release to December 2021 is 23 months, almost two years! And if Fighter 6 is Spring Man, then that makes it even easier, because Spring Man is already halfway finished with his Assist Trophy.
This liberal deadline got me thinking. I was hoping to release this list later, but I'll go ahead and show it now:
View attachment 269268
This is a list of Individual DLC that
Evil Trapezium
and I came up with. These are popular Smash requests that do not really require a stage, Spirit Board, or music (though Geno would probably come with Forest Maze music like how Cuphead and Sans came with single music tracks).
And these are just my picks. There are PLENTY of characters on the table that don't need to come in a Challenger Pack! Impa, Bandana Waddle Dee, Tetra, any Pokémon, Alucard, Krystal, Toad, Tom Nook, Ashley, Chun-Li, etc, etc, etc.