The Psychonauts 2 backer update today hinted at Raz possibly being added as a playable character in Smash.
They showed the Raz minifigure backer reward and joked about it being an Amiibo (which it's not), then said they were announcing Raz as playable in Smash Ultimate but a disclaimer popped up at the bottom of the screen saying "Raz is not playable
(yet)
" or something like that.
Seems like a joke, but Tim Schafer looked like he'd totally be on board if Nintendo wanted to make it happen.