Mario & Luigi, Paper Mario, and Warioware are the Mario series Nintendo reserves most of their creativity for. But even then, the last bunch have seemed sorta lackluster in that regard.
Truly the kids in the rain are the Earthbound/Mother fans. They wouldn't even let us have Oddity!
HE HAS FURY! and he was a very fun final boss in the third game.
The bean people in general were cool. I noticed there were even a couple in the Thousand Year Door when I was playing the remake, I wonder why Nintendo doesn't use them anymore?
Kind of makes me think that dev team was shut down from making new games already at that point and they were doing what they could with the budget left.