In a Harry Potter Kim Possible crossover fanfiction, a great plot could be that Voldemort discovers the existence of Kim Possible's world and decides to invade it to gain more power. He sends his Death Eaters to steal advanced technology. Harry, Hermione, and Ron follow them through a magical portal. There, they meet Kim and her team. Kim is initially skeptical of magic but soon realizes they need to work together. They combine magic and technology to fight off the Death Eaters and prevent Voldemort from getting his hands on the powerful tech.
Well, perhaps in the fanfic, Voldemort has somehow found a way to cross over into Kim's world too. Harry, now adopted by Kim, has to protect both his new family and this new world. Kim and her friends are initially skeptical about Harry's magic but soon realize how useful it can be. They start training together, with Kim teaching Harry some of her combat moves and Harry showing her the basics of magic. This way, they combine their skills to face the threat of Voldemort and his new minions in this strange new world.
Another plot could involve Harry Potter visiting Kim's world. He'd be amazed by all the high - tech gadgets. Kim and her friends could introduce Harry to the concept of global crime - fighting on a non - magical level. Harry, in turn, could show them some basic magic tricks, and together they could stop a villain who's trying to steal both magical and technological secrets.
Well, perhaps the magical creatures from the Harry Potter universe end up in the '300' setting. Dragons could be used by the Spartans to fight their enemies. The centaurs could also join the battle, lending their archery skills. And Harry could learn some combat skills from the Spartans, which he could then use back in the wizarding world to fight Voldemort's Death Eaters.
Perhaps there's a magical artifact in the Daredevil world that has some connection to the wizarding world. Daredevil and his allies start to investigate it, and this draws the attention of wizards from Harry Potter's world. They have to work together to figure out the true nature of the artifact, all while facing threats from both the criminal underworld of Daredevil's world and dark wizards who want the artifact for their own nefarious purposes. As they collaborate, they learn from each other's skills and ways of life.
Well, it could be a really wild plot. Maybe the Chaos Gods try to disrupt Kim's normal crime - fighting routine in Middleton. They might start by causing chaos in the villains she usually faces, making them even more unpredictable. For example, Drakken could get some sort of chaotic power boost that makes his schemes even crazier than before. Kim would then have to figure out not only how to stop the villains but also deal with the influence of the Chaos Gods on them.
Definitely Harry Potter and Kim Possible themselves. Harry has his whole wizarding world experience and his fight against dark magic, and Kim has her crime - fighting skills and high - tech gadgets. Their different worlds and abilities would create a really interesting dynamic as they try to understand each other and work together.
The Stargate could be a portal between different magical realms in the Harry Potter universe. For example, it could lead to a place where ancient and more powerful magic exists. Wizards from different schools around the world could team up with Stargate explorers to uncover the secrets of this new place. There might be a new threat emerging from this realm that requires both magic and Stargate technology to defeat. This would bring together characters like Harry Potter and Jack O'Neill to lead the charge against the common enemy.
Well, perhaps there's a rift in the multiverse that connects Central City to Hogwarts. The Flash, while chasing a villain, gets sucked into the wizarding world. Harry Potter and his friends initially suspect him as a threat but then realize his good intentions. They then combine their powers - the Flash's speed and the magic of the wizards - to fight a common enemy. For example, the Flash could use his speed to distribute protective spells all over Hogwarts really quickly, while Harry and his friends focus on the offensive magic against the bad guys.
One idea could be that Carly and her friends discover a magical portal in their apartment that leads to Hogwarts. They then have to navigate the wizarding world, with Carly being fascinated by all the magic. Meanwhile, Harry Potter and his friends are intrigued by the strange Muggle - like devices the iCarly gang has. They end up teaming up to solve a mystery that involves both the wizarding and Muggle worlds.
Well, perhaps the Death Note from the Bleach universe gets mixed up with the magic in Harry Potter's world. A powerful wizard could get hold of it and start using it in ways that disrupt the balance of life and death in both worlds. Harry and his friends would have to figure out how to stop this misuse, with the help of some Bleach characters who understand the true nature of the Death Note.