Definitely Iron Man and Harry Potter. Iron Man's cool gadgets and snarky personality combined with Harry's magical abilities and heroic nature make them a great pair in crossovers.
Loki is another character that is very popular in these crossovers. His mischievous nature can create all sorts of chaos in the Harry Potter universe. And on the Avengers side, Captain America is often included. His sense of justice and leadership can be an interesting contrast to the magical world's own set of values, and he can lead the combined group in battles against common enemies.
Harry Potter himself is often a popular character in these crossovers. Writers like to imagine how he would react to the Pokemon world. He might be intrigued by the concept of Pokemon training and try to incorporate some of the Pokemon's abilities into his fight against Voldemort.
Harry Potter himself is quite popular. His status as the Boy Who Lived gives him a certain allure in the crossovers. Fans like to imagine how he would handle the different threats in the Shadowhunter world. Clary Fray is also a favorite. Her journey as a Shadowhunter, especially her discovery of her powers, can be paralleled with Harry's discovery of his wizarding abilities. And when they interact, it can lead to some really engaging storylines.
Hermione Granger is often a popular character in these crossovers. Her intelligence and magical knowledge make her adaptable in the Legend of Korra world. She could study the bending arts and come up with new strategies.
One of the most used characters is Severus Snape. His complex personality and his role in the Harry Potter series can be explored in new ways when put into a crossover. In Fire Emblem, Ephraim is also a character that features frequently. His strategic mind and combat abilities can be interestingly paired with the magical aspects of Harry Potter. And let's not forget about Fire Emblem's Robin. Robin's intelligence and magical knowledge can make for a great match when interacting with the characters from Harry Potter, especially when it comes to solving mysteries or fighting against dark forces.
Hermione Granger is often a popular choice. Her intelligence and thirst for knowledge can be an interesting addition to the Dragon Age world. She could study the magic there and perhaps help solve some of the problems in Thedas. Another popular character is Alistair from Dragon Age. His noble and somewhat naive nature could create some interesting scenarios when placed in the world of Harry Potter, especially at Hogwarts where he'd have to learn a whole new set of magical rules.
Definitely Iron Man. His technological genius makes for an interesting contrast with the more 'Force - based' technology in Star Wars. Another popular one is Darth Vader. His imposing presence and dark powers can create some really intense storylines when paired with the Avengers. And of course, Luke Skywalker. He's the classic hero of Star Wars, and seeing him interact with the Avengers is always a fan favorite.
Well, Loki and Draco Malfoy are quite popular in these fanfictions. Both are complex characters with a bit of a dark side. They could potentially team up or have a strange friendship. Also, Thor and Hagrid might be a fun pairing. Thor's god - like strength and Hagrid's love for large and powerful creatures could lead to some humorous and interesting scenarios.
One popular pairing is Harry Potter and Captain America. They both have a strong sense of justice and leadership. People like to imagine them sharing their experiences and learning from each other. Another is Hermione and Tony Stark. Hermione's intelligence and thirst for knowledge would match well with Stark's genius in technology.
In the Harry Potter universe, one of the most notable inventors is Albus Dumbledore. He invented things like the Philosopher's Stone which has many magical properties. In the Avengers universe, Tony Stark is a great inventor. He created the Iron Man suit which has a wide range of capabilities from flight to super - strength. Another could be Bruce Banner who invented things in the field of gamma radiation research that led to his Hulk transformation.
One popular pairing could be Harry Potter and Tony Stark. They both are leaders in their own ways, with Harry leading the fight against Voldemort and Tony leading the Avengers. Their different styles of problem - solving and leadership could make for an interesting dynamic in a fanfiction.