@09MurphyM
Didn’t stop Bayonetta, and Solid Snake (M-Rated game characters) to make it in.
@igotnopicks
I doubt we’ll see any MK characters, because WB owns that series now, (and knowing them, they’ll charge too much money for the license, and DLC sales) and because Western properties don’t seem to make it into SSBU, being a Japanese game.
In fact, Dark Samus is the only “American” invented character to ever appear in SSB. (Retro Studios.) While Diddy, K.Rool, and Banjo Kazooie were made by British developer Rareware.
Though, some Japanese-made series that aren’t popular in Japan, but popular in the USA/Europe/ect. do make it in SSB. (Like Sonic, Star Fox, Metroid, Castlevania, and Punch-Out!!) and there are assists & spirits based on Western properties, (like Shovel Knight) so there’s some fan-service for Westerners.
I’ll be surprised if any American game series make it as SSBU DLC.