So excited to see this unfold. Rick and Morty is BRILLIANT and there are almost too any things going on in this show to cram into one machine.
First things that came to mind for me was a meeseeks multiball. Maybe the meeseeks box as a toy on the playfied that starts it. However it gets going it has to be as many balls and as obnoxious as possible.
Also a Unity mode. Maybe something where she will spread by lighting other targets (with a vomiting in a persons mouth animation) and you need to eliminate them all before Rick falls for her.
Something with Mr. Poopybutthole, somethig with Abradolf Lincler. I would like to see elements from every family member too. Jerry is obvious, but maybe a summer mode with her doofus boyfriend.
I love anatomy park. Hell that could be a pinball machine in itself. Maybe some elements of that in a mode.
Finally, my personal favorite, BIRD PERSON.