One idea could be that the Digimon are discovered in the Forbidden Forest at Hogwarts. The students, including Harry and his friends, have to figure out how to interact with these strange new creatures. Maybe the Digimon have some unique magical abilities that can help in the fight against Voldemort, or they could be the key to unlocking an ancient magic within Hogwarts.
A great plot could be that the Digivices (the devices used to interact with Digimon in the original series) are mistaken for some sort of new magical artifacts in the wizarding world. Wizards start to experiment with them, and accidentally open a portal between the two worlds. Harry and his friends then have to work with the Digimon to close the portal before it causes chaos, like allowing dark Digimon to enter the wizarding world or vice - versa.
A possible plot is that the dragoness has a special ability to see the future. Harry Potter, desperate to know what lies ahead in his fight against Voldemort, seeks her out. But the dragoness doesn't give him the answers easily. Instead, she sets him on a series of tasks to prove his worth. Along the way, Harry learns valuable lessons about himself and the power of magic. Another idea is that the dragoness lives in a parallel magical dimension. Harry Potter accidentally stumbles into this dimension and has to work with the dragoness to find a way back home while also dealing with the unique challenges of this new world.
A really interesting plot would be if Rose accidentally gets sent back in time to when Harry was at Hogwarts during his early years. She has to figure out how to get back to her own time while also not disrupting the past too much. Along the way, Harry and his friends help her, and she in turn gives them some insights from the future. This would be a great way to explore their relationship across different time periods in a non - sexual way. Also, a plot where they work together to stop a new dark wizard threat at Hogwarts that the adults are oblivious to. They would have to use their combined skills and knowledge to outwit the enemy.
In a fanfiction, the fox could be a shape - shifter who takes on a human form and has a special connection to lemons. This fox - human meets Harry Potter at Hogwarts. They start to investigate a mystery involving lemon - based potions that are being misused to control students' minds, and Harry needs the fox - human's unique abilities to solve the case.
One idea could be that a centaur saves Harry from a dangerous creature in the Forbidden Forest and then they form a bond. The centaur could teach Harry about the ancient magic that the centaurs possess. Another plot could be a centaur acting as a guide for Harry during his search for a rare magical herb that only grows in centaur - protected areas. They would have to work together to overcome various obstacles.
One idea could be that a Succubus is a new kind of magical creature discovered in the Forbidden Forest. The Hogwarts students and professors have to figure out how to deal with it, whether it's a threat or not. Another could be a Succubus who has lost her powers and comes to Hogwarts seeking help to regain them in a non - sexual way, like learning about different kinds of magic.
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.
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.
A plot could revolve around Hermione starting a research project in Vegas. She's interested in the way magic is used in the entertainment industry there. Harry and Ron come along to support her. Along the way, they meet a group of local wizards who are being exploited by a powerful wizard entrepreneur. The trio decides to help these local wizards stand up for their rights and also uncover a plot by the entrepreneur to use dark magic to boost his business.
One idea could be a fanfiction where Voldemort has a change of heart due to some ancient magic. Maybe he discovers a spell that shows him the true consequences of his actions and decides to work with Harry to fix the wizarding world instead of destroying it.
One plot idea could be a time - travel scenario where Harry goes back in time and tries to befriend a young Tom Riddle before he turns evil. He could try to influence Riddle's life in a positive way, perhaps by introducing him to different values or people. Another idea is that Harry discovers a hidden part of Tom Riddle's past that holds the key to defeating Voldemort in a more psychological way, rather than just through magic battles.