So a couple days ago, I was looking into some older Smash stuff, and I came across this old Source Gaming article:
Super Smash Bros is a series that brings together a ton of Nintendo’s IP into one massive series. Unfortunatley there are just too many IP for them all to get some representation. So, in part…
sourcegaming.info
This is a list of Nintendo IP not in Smash, and it's from the Smash 4 era. It's fascinating to look back on this after Ultimate went ridiculously hard on Nintendo history for its spirit selection.
The IP listed here are shown in various categories that try to explain why they may not be in. Some are from the earrrrrrly days of Nintendo, some are kind of western-centric, some are kind of simple and thus wouldn't have much to pull from, and some he thinks are just plain obscure enough to not get a look. But after all that, there's an "I have no clue" section, for IP that he thinks by all rights made perfect sense for Smash representation but missed the cut.
Out of those 14 big missing IP?
11 made it to Ultimate, leaving only 3 still on the outside looking in: Pro Wrestling, Endless Ocean and KoroKoro Puzzle. Not only that, but 11 more IP in the "probably too obscure" section made it, and we even got one from the Western section (Eternal Darkness), and there's at least one IP Ultimate included that this list outright missed (Saru Band). It's fascinating, and it really goes to show how cool it is that Ultimate went so deep on the Nintendo history well. Seeing so many IP come back that were in Melee and Brawl but not 4, plus finally seeing notable games like Eternal Darkness, Marvelous and GiFTPiA get the Smash nod, is really nice. Cool ****.