What are the possible plot ideas in 'Harry Potter x Jon from the Watchmen' fanfic?

I'm not sure about a specific one off the top of my head. But you can try looking on fanfic websites like Archive of Our Own. They usually have a large collection of crossover fanfics, and you might be able to find some great 'Harry Potter x Jon from the Watchmen' ones by using their search function.

One possible plot could be that Sesshomaru somehow ends up in the wizarding world of Harry Potter. Maybe a magical portal or a powerful spell goes wrong. He then has to navigate this new world with its own set of rules and magic, and he might encounter Harry and his friends.

One plot idea could be that Mavis gets lost in the wizarding world and Harry has to help her find her way back to her own world. Along the way, they face various challenges like dark wizards who want to capture Mavis for her unique magic. Another could be that there's a threat that endangers both their worlds, and they must combine their powers to stop it. Maybe there's a powerful dark force that is trying to merge the two worlds in a chaotic way, and Harry and Mavis are the only ones who can prevent it.

One plot could be that Harry Potter is bitten by a vampire during one of his adventures outside Hogwarts. He then has to struggle with his new vampiric nature while still trying to protect the wizarding world from dark forces. Another idea is that there is a hidden vampire community within the wizarding world that Harry discovers, and he has to deal with the politics and secrets there.

A possible plot could involve a spell gone wrong in the Harry Potter universe that opens a portal to the Hell Raiser world. As a result, some of the Hogwarts students get trapped in that terrifying realm. They then have to use their magic in new and creative ways to survive and find a way back home, all while being hunted by the hellish creatures. This could also lead to some of the Hell Raiser characters becoming interested in the power of magic and trying to take it for themselves.

Perhaps there's a prophecy in both universes that foretells of a coming disaster that can only be averted by the combined forces of the wizarding world and Riddick. Riddick is drawn to the wizarding world because of some strange magic that he senses. Once there, he meets Harry Potter. At first, they don't trust each other. But as they face challenges together, like strange magical - mechanical hybrids created by a rogue wizard who has been experimenting with technology from Riddick's world, they start to respect and rely on each other, ultimately working together to save both universes.

Maybe the Sorting Hat could be used on the Transformers. The Autobots are sorted into Gryffindor for their bravery and the Decepticons into Slytherin for their cunning. Then a battle ensues within Hogwarts between the two factions, with the wizards caught in the middle, trying to keep the peace and protect their school.

One possible plot idea could be how Snape deals with the physical and emotional changes during the pregnancy while still trying to maintain his role at Hogwarts. Another could be the reactions of other characters like Harry, Hermione, and Ron when they find out.

One possible plot could be that a Naruto character is transported to the Harry Potter world and has to let go of their chakra - based powers as they don't work there and learn magic instead, but they struggle with 'letting it die' i.e. their old way of fighting.

Gabriel could be an exchange student from a far - flung wizarding school. He brings with him a different style of magic. Harry Potter is both curious and cautious about him. As they study together, they find out that a series of strange magical occurrences around Hogwarts are related to a curse from Gabriel's home school. Together, they try to break the curse while also learning about the cultural differences in magic, which enriches their own magical understanding.