There are indeed Rick and Morty comics. They're a great way for fans to immerse themselves deeper into the world of Rick and Morty. The comics sometimes explore concepts and characters that might not have been featured prominently in the show.
Well, an 'Evil Morty' fanfic in the 'Rick and Morty' universe can be really interesting. Evil Morty is such a complex character. In these fanfics, he could be explored further in terms of his motives. Maybe he's tired of being in Rick's shadow or he has some grand plan to take over the multiverse that wasn't fully shown in the show. Fanfics give the writers the freedom to expand on his backstory and what makes him tick.
Rick and Morty didn't start as a comic. It first gained popularity as an animated series. The show's unique storyline and characters made it a hit before any comic adaptations were made.
I'm not aware of any Rick and Morty comic in the newspaper. Maybe it's possible in some very specific or niche newspapers, but it's not a common occurrence.
I think they're good. The comics expand on the universe of the show and offer new adventures for the characters. The humor and creativity are still top-notch.
One more thing that makes these fanfics unique is the way they can twist the relationships in the show. Evil Morty's presence can change the dynamics between Rick and Morty. For instance, Morty might start to question Rick more if he sees what an Evil version of himself is capable of. And Rick might have to reevaluate his relationship with Morty in light of this new threat. This creates a whole new set of story possibilities that are unique to these fanfics.