One idea could be the Digimon characters getting lost in Wonderland. They might encounter the strange creatures of Wonderland and have to figure out how to get back to their own world. For example, Agumon could meet the Cheshire Cat and have a confusing conversation about directions.
A possible plot is a quest in Wonderland to find a special item that can save both the Digimon world and Wonderland. The Digimon and some of the Wonderland characters team up. They face various obstacles like the Queen of Hearts' trials, all while trying to understand each other's very different natures.
One idea could be Harry finding himself in Wonderland during a strange magical accident at Hogwarts. He could encounter the Cheshire Cat as a magical creature that can disappear and reappear, leading him on a quest to find a way back home while also uncovering secrets about the Wonderland's connection to the wizarding world.
One idea could be exploring the backstories of the minor characters in Deadman Wonderland. For example, you could write about how a particular inmate ended up in the prison. Another could be a what - if scenario, like what if Ganta had different powers. Maybe he could control water instead of his blood bullets.
One idea could be that Alice returns to Wonderland as an adult and finds it has changed completely. The once friendly characters are now in a state of chaos due to a new dark force. Another could be a story where Wonderland is connected to our world in a more secretive way, and Alice has to keep the balance between the two. Or perhaps a fanfiction where Alice teams up with the Cheshire Cat to solve a mystery that involves all the Wonderland characters and their forgotten pasts.
A plot could involve a group of dark digimon forming an alliance to take over a particular area of the digital world. They start by targeting the weakest digimon settlements. The story could follow a young digimon trainer who tries to gather allies to fight back against this dark alliance. There could be many challenges along the way, like finding rare and powerful digimon to join the cause, and also dealing with the psychological warfare that the dark digimon use. For example, they might spread false rumors to cause distrust among the good digimon.
One idea could be Harry finding a hidden portal in Hogwarts that leads him to Wonderland. There, he meets the Cheshire Cat who helps him understand some of the mysteries of the wizarding world in a different way. Maybe he has to solve Wonderland - like riddles to get back to Hogwarts.
Well, perhaps in the fanfiction, the Queen of Hearts is allergic to lemons. And Alice, unknowingly, brings lemons into the Queen's court. This causes chaos as the Queen starts sneezing and her usual angry outbursts are now mixed with her allergy-induced irritation. It could lead to a series of comical and adventurous events as Alice tries to fix the situation.
One interesting plot could be a time - travel story in the Harry Potter wonderland. For example, a character goes back in time to the Marauders' era and gets involved in their adventures, while also trying to prevent a future disaster in the wizarding world. Another idea is a story where a new, powerful magic is discovered in the wonderland, and Harry and his friends have to figure out how to control it before it falls into the wrong hands. A third plot could be about an alternate reality where Voldemort won the war, and the remaining good characters have to find a way to reverse the situation in the harry potter wonderland.
One idea could be that Davis gets transported to a different Digimon universe where the rules are all mixed up. For example, Digimon don't evolve in the traditional way. He has to figure out how to adapt and find his way back home while also making new friends and facing new enemies.
One idea could be the main character using gamer skills to quickly level up their Digimon in unexpected ways. For example, finding glitches in the Digimon world that allow for super - fast evolution. Another could be a tournament - style story where the gamer - like abilities of the protagonist give them an edge over other Digimon tamers.
One idea could be that Takeru and Wallace team up to explore a new, mysterious Digital World area. They encounter a new Digimon species that has unique powers. They have to figure out how to befriend it without getting into trouble.