One way is to make Shadow a sort of 'guardian' figure in the Harry Potter world. He could be summoned by an ancient magic prophecy to protect Hogwarts. His super speed and strength would be a great asset in protecting the school from dark wizards and magical creatures. Harry and his friends would initially be suspicious of Shadow but as they see him fight for their cause, they come to trust and rely on him.
A way to combine them could be through a shared enemy. Let's say there's a new dark force that is affecting both Sonic's world (where Shadow is from) and the wizarding world. Shadow and Harry, along with their respective friends, have to work together to defeat this enemy. They would have to learn to communicate despite their different backgrounds and abilities. Shadow might teach the wizards some physical combat skills, while the wizards could teach Shadow about magic. This kind of interaction between the two groups of characters would make for an exciting fanfiction.
A great way to combine them is through a magical experiment gone wrong. Maybe a wizard in Hogwarts was trying to create a new type of magical creature and accidentally summoned Pikachu. Then, Pikachu starts to interact with the students, like helping Hermione with her studies by using its electric shocks to represent different spells, which could be a really interesting and fun combination.
One idea could be that Shadow somehow gets transported into the Harry Potter world. He might use his speed and combat skills to help the students at Hogwarts during a time of great danger, like when Voldemort's forces are attacking. Maybe he teams up with Harry and they learn from each other's fighting styles.
Well, perhaps in this fanfiction, Shadow the Hedgehog is on a mission to find a powerful magical artifact which he believes is hidden in the wizarding world. Harry Potter and his friends get involved when they notice strange things happening around Hogwarts. Together, they form an unlikely alliance. Harry uses his knowledge of magic and Hogwarts' secrets, while Shadow uses his super speed and combat skills to overcome the various obstacles and villains that stand in their way.
Edward's alchemy skills and Harry's magic could combine in combat. For instance, Edward could transmute the environment to create barriers or platforms, while Harry uses spells to attack over or through these structures. Hermione's knowledge of magic and Edward's knowledge of alchemy could lead to some amazing new discoveries. They could combine their research skills to find solutions to problems that neither world has faced before.
The Avengers' superpowers and the magic of Harry Potter characters can combine in many ways. For instance, Captain America's combat skills combined with Harry's ability to use spells like Expelliarmus could make them a formidable duo in a fight. They could teach each other new fighting techniques.
No. Harry Potter and Sonic the Hedgehog are from two completely different fictional universes. Harry Potter is a wizarding world with magic, Hogwarts, and dark lords, while Sonic is about a super - fast blue hedgehog fighting Dr. Eggman in a more technological and zany world. There's no indication in the original Harry Potter works that it has any relation to Sonic fanfiction.
Obviously, Shadow the Hedgehog is a main character. He's the one with the vampire - like qualities. Sonic could also be a main character in some fanfictions. He might be in conflict with Shadow because of his new vampire nature or could be trying to help him control it. Amy could be another main character, perhaps she has a special connection to Shadow and tries to understand his transformation.
Well, in fanfiction, you could have Harry's magic interact with the Incredibles' superpowers in a fight. For instance, if they were facing a common enemy. Harry could use spells to enhance the Incredibles' powers. His levitation charm on Mr. Incredible could make him jump even higher and land more powerfully.
It can combine the two by having the characters cross over. For instance, Harry could be invited to MI6 to share his knowledge of dark magic as they face some sort of dark magical threat in the Muggle world.
They can co - exist if there is a common goal. For example, if a powerful and evil force threatens both Shadow's world and the My Little Pony world. They would have to work together to defeat this enemy. Shadow could use his combat skills and speed, while the ponies use their magic and friendship power.