Well, perhaps there's a science experiment gone wrong at Monster High that creates a rift in the multiverse, pulling Peter Parker into their world. He teams up with Frankie Stein, who is also interested in science. Together, they try to find a way to close the rift while also dealing with the social drama at Monster High. The vampires might be causing trouble because they don't trust an outsider like Peter, but in the end, he wins them over with his heroic deeds.
Venom could be a formidable antagonist. He might be attracted to the chaos and different powers at Monster High. He could start infecting some of the students, turning them into his minions. Additionally, a group of anti - monster humans from Peter's world could find out about Monster High and decide to invade it. They see the monsters as a threat and want to 'cleanse' the school, which would put Peter in a difficult position as he has to protect his new friends from his own kind.
One possible plot could be that Ben 10's aliens end up in the Monster High world. For example, Four Arms could get into a friendly strength - testing competition with some of the stronger monsters at Monster High like the werewolves. It would be a clash of different kinds of powers and cultures. Ben, in his human form, might also have to figure out how to fit in and make friends with the unique students at Monster High.
A cool plot might be that Voldemort somehow discovers the existence of Monster High and plans to use the unique powers of the monsters there for his own evil purposes. So, Dumbledore sends a group of Hogwarts students, including Harry, to Monster High to warn them and form an alliance. The Monster High students, led by Frankie Stein and Draculaura, join forces with the Hogwarts students. They then have to use a combination of magic and monster abilities to stop Voldemort's plan, which could involve some sort of dark spell that would not only affect the wizarding world but also Monster High if successful.
The field trip could be to a historical site. Peter senses that there are some ancient artifacts with strange powers hidden there. A group of thieves, who are also aware of the powers, are planning to steal them. Peter has to figure out how to stop them. He could use his knowledge of history (from all his studying) to outwit the thieves. For example, he might know of a secret passage or a trap that he can use to his advantage to protect the artifacts and keep his classmates safe at the same time.
In this type of fanfiction, the plot could start with Peter discovering his immortality after a near - death experience. He realizes that he can't die no matter what. This makes him question his own identity and his role as Spider - Man. He decides to travel the world, learning different fighting techniques and knowledge. Along the way, he still tries to protect the innocent. But he also has to deal with the fact that he will outlive everyone he loves. He might even try to find a way to reverse his immortality at some point.
Well, the plot could involve Peter Parker using his scientific knowledge to create a revolutionary product that makes him extremely wealthy overnight. With his new wealth, he decides to fund various projects in New York to fight crime more effectively. He might also face new enemies who are after his money or try to use his wealth for their own evil purposes. And his personal life would change too, as he'd be living a more luxurious lifestyle while still trying to keep his identity as Spider - Man a secret.
A plot could involve Peter going on a long - distance mission with the Avengers. They're in a quinjet or some other vehicle. Peter starts feeling carsick because of the unfamiliar motion. His carsickness becomes a bit of a problem during the mission as it affects his performance. So, the other Avengers have to figure out how to deal with it while also handling the mission at hand. It could add a touch of humor and a new dynamic to the story.
In a 'Peter Parker Funeral' fanfiction, the story might start with the discovery of Peter's death. It could be due to a powerful villain finally getting the upper hand. His Aunt May is heartbroken. The funeral could be a very private affair, with only his closest friends and family. But as the news spreads, the whole city starts to remember Spider - Man's deeds. There could be a lot of flashbacks in the fanfiction, showing how Peter grew into the hero he was.
One possible plot could be that Peter Parker is experimented on by some villain who wants to create chaos. The experiment goes wrong and it starts to mess with his mind, turning him into a Joker - like figure. He then starts to cause mayhem in New York City, using his spider - powers in ways that are more for destruction and amusement rather than heroism. His friends and family are shocked and try to figure out what happened to him and how to bring him back to his normal self.
One possible plot could be that Peter discovers he has Asgardian blood through some magical accident. He then starts to have visions of Asgard and is eventually drawn there. Once in Asgard, he has to prove himself worthy, just like Thor did with Mjolnir, but with his own unique set of skills as Spider - Man.