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This video implies that Joker was more of a Sakurai pick from the whole SEGA pool, as a major Persona (and Persona 5) fan. It could also indicate that having a Nintendo appearances OF SOME KIND increases the recognizability of the character, as well as his/her chances of getting into Smash as a playable fighter.
Going off of this, I don't necessarily agree with what
volbound1700
said here, but I think it's important:
I can't think of a character that fits this bill, however, not even Master Chief imo. I know XBOX isn't big in Japan, but Chief is at least KNOWN in Japan.
I still firmly believe that ever since Joker, ANYONE was possible. And my statement seems to still stand strong.