I'm pretty sure it's not real. There's no concrete evidence or reliable source to confirm its authenticity. It could just be a story someone came up with for entertainment.
One common theme is adventure. Montgomery Gator is often depicted going on exciting adventures in the fanfic world. Another theme could be friendship, as he forms bonds with other characters.
In the world of RDR2, the monster gator story is a legend among the locals. Legend has it that this gator is not an ordinary one. It's been said that it has some sort of supernatural element to it. One time, a fisherman was fishing near the edge of the swamp. He saw the gator swim by, and it left a trail of what seemed like an otherworldly glow in the water. He was so scared that he never went back to that part of the swamp again.
In the 'sakura kills gator fanfiction', it could be that Sakura has a very good reason for killing the gator. For example, if it's set in a fantasy world, the gator might be a menacing beast that has been terrorizing the local area or has some sort of connection to an evil force. Sakura, being a heroic or determined character, decides to take matters into her own hands and end the threat posed by the gator. But again, this is just one possible scenario based on the title alone.
The term 'Meth Gator' might be a very specific or regional thing. It could potentially refer to a gator that was somehow affected by methamphetamine use in the area around it, perhaps in a place where drug use has had an impact on the local wildlife. But this is just speculation. Maybe it's a story created to warn about the dangers of drug use and its far - reaching consequences on the environment and animals. However, without more details, it's really difficult to give a more accurate account of the real story.
They could get really into it and start coming up with their own ideas for horror stories based on what they've just heard. Maybe they think about how they could make the story even scarier or what different twists they could add. Their reactions might inspire them to create horror - related content, like short films or podcasts that explore similar themes.
One possible fanfiction could be about Jasper and Monty's adventures before they landed on the ground. Maybe they were planning all the things they would do together, like exploring the new world and finding new technologies. It could show their strong bond of friendship even in the face of the unknown in space.