The fact that Pikmin is gonna find its way into the park really has me curious if they'll have other ways of implementing more non-Mario IPs outside of expansions.
At the very least, assuming the land has one, I think non-Mario characters appearing in a character meet area could be a start.
I know I'm the one with a Kirby pfp, but who wouldn't want to hug Kirby for instance? If anyone is wondering how a mascot Kirby would work, look no further: