Rick might react with his usual nonchalance at first, but then secretly be worried. He may start to fix Morty up while muttering about how Morty should be more careful. For example, he'd quickly grab some alien - goo - bandages and start patching Morty up while still complaining.
They could have mixed reactions. Some might laugh out loud at the absurdity of some of the fan - created stories. It's like seeing a different side of their world through the eyes of the fans.
In the light novel, Ayanokoji is clearly the more intelligent one. He has a unique ability to analyze situations and people's motives deeply. Ryuen often falls into Ayanokoji's traps because he doesn't fully understand Ayanokoji's true nature. Ayanokoji can anticipate Ryuen's moves and counter them effectively, while Ryuen struggles to keep up with Ayanokoji's complex thinking.
Summer might be jealous at first. She's used to being the only daughter and having a new baby in the family could mean less attention for her. But as she realizes that the baby is going to be part of the family, she could become really protective. She might also start to think about how she can be a cool big sister and teach the baby all sorts of things she's learned from her adventures with Rick and Morty.
When Ayanokoji says 'I'll use any means necessary to achieve my goal', it reveals his somewhat ruthless side. He is not bound by conventional moralities when it comes to reaching his objectives. In the light novel, this could be a result of the cut - throat environment he is in. However, it also makes him a complex character as readers are left to question whether his actions are justifiable or not.
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.
In such a fanfic, one aspect could be how Jessica views Morty. She might initially be dismissive or not even notice him, but as the story progresses, she could start to see his hidden qualities. Also, the fanfic could play with the different dimensions in Rick and Morty. For example, there could be a dimension where Morty and Jessica are already a couple, and Morty from our main dimension tries to learn from that version of himself to win Jessica in his own world.