There could be a dark dragon rider who doesn't want a new dragon in the world that could oppose his evil plans. He will do everything he can to prevent Jon from hatching the egg or, if it's hatched, to kill the young dragon.
It could be a power - hungry wizard who wants the dragon for himself. He might try to steal the egg from Jon before it hatches or take the newly - hatched dragon by force.
Maybe it's about Jon finding a dragon egg and through some magical or difficult process, he manages to hatch it. He could face challenges like protecting the egg from those who want to use it for evil, and once the dragon is hatched, they form a strong bond and go on adventures together.
Well, in the fanfic, it could be that Jon Snow stumbles upon the dragon egg while on a mission beyond the Wall. He might not even realize what it is at first. But as he holds it, some latent magic within him starts to interact with the egg. As it hatches, the dragon imprints on Jon like in some old legends. The dragon's presence then forces Jon to reevaluate his role in the world. He could use the dragon to fight the White Walkers more effectively, or he might face opposition from the current rulers who fear his new - found power. It could also open up a whole new arc where Jon has to learn how to train and communicate with his dragon.
Well, perhaps Jon finds a dragon egg in a hidden cave. He takes it home and starts to take care of it. As he does, he begins to notice strange markings on the egg that seem to glow at night. Eventually, the egg hatches and out comes a small, cute dragon that he names something like 'Spark'.
There could be a wise old wizard who gives Jon advice on how to hatch and take care of the dragon. Maybe there's also a rival of Jon's who is jealous of his discovery and tries to steal the dragon egg.
Voldemort could be the main antagonist. Even though he's gone in the original story, in this fanfiction, he might be resurrected or his followers could be after the dragon. They might see the dragon as a powerful weapon to use against Harry and the wizarding world.
The World Government could be the main antagonist in a more complex way. They could be secretly manipulating events to pit Dragon and Luffy against each other. For example, they could spread false rumors about Luffy being a tool of the revolutionaries, which would make other pirate crews and kingdoms target him, and at the same time make Dragon look bad for having a son who is causing so much chaos. This would force Dragon and Luffy to either fight each other or find a way to clear their names together.
One possible plot twist could be that the dragon has a special bond with Jon Snow that allows them to communicate telepathically. This would give Jon an edge in battles and political intrigue. Another could be that the dragon's hatching is part of a prophecy that no one expected Jon to fulfill, leading to a power struggle among the characters who thought they were the rightful ones in the prophecy.
It could be about a character named Jon hatching dragons in a fan - created fictional story. Maybe it details the process of the hatching, the relationship between Jon and the newly hatched dragons, and the adventures that follow.
If Jon Snow hatches a dragon in the fanfic, it would completely disrupt the power balance in the Game of Thrones world. Dragons are extremely powerful creatures, and having one on Jon's side would make him a formidable force. He could use it to quickly travel across Westeros, intimidate his enemies, and gain more support. This would likely cause other rulers to either try to ally with him or plot against him more vehemently. The Night King and the White Walkers would also have a new and dangerous adversary, as a dragon could be a very effective weapon against them.
It could be Morgana. She might see Merlin's transformation into a dragon as a threat to her own power and plans. So, she tries to stop him from fully becoming a dragon or tries to use his new form for her own evil purposes.