You could probably get away with it under fair use laws, as I don't see that taking away from the value of the copyright and you appear to be using it for research purposes, but the problem with fair use is that it's decided AFTER the fact. The fact that it's a creative work and the volume of material you're using also works against you in this case. As u/soicyboii stated, asking them is your best bet if you insist on sticking with Rick and Morty.