Quoted from Zampinator:South Park or drum roll.............. Predator.
South Park: To this day it is still doing well on route, from what I'm told. Imagine a new version with Heighway's tech in a wide body! It would sell & do very well. Plus, from what I understand Andrew is a big South Park fan.
South park would be great however i would still prefer a rick and morty themed pin as possibilities are endless due to the fact that infinite multiverses,portals and time travel are present in the show which would allow for some interesting ideas and custom callouts that would break the fourth wall (knowing that they are "inside" a pinball machine)