The mixing of different power sets. For example, Buffy's slayer strength and combat skills combined with Thor's god - like powers make for some epic fight scenes. It's fascinating to see how they would interact in a battle situation.
The cultural clash is also really interesting. The Avengers come from a more modern, high - tech world, while Buffy's world is filled with magic and ancient prophecies. So, seeing how characters like Captain America react to the idea of magic and demons adds a lot of depth and humor to the story. And the relationships that form between the characters from both universes. For instance, maybe a friendship between Xander and Hawkeye as they compare notes on being the 'normal' ones in a group of extraordinary individuals.
The combination of powers. You get to see the superpowers of the X - Men, like Jean Grey's telekinesis and Cyclops' optic blasts, interact with the powers of the Avengers such as Thor's lightning and Captain America's super - strength. It makes for some really epic battle scenes.
The clash of cultures is really exciting too. The modern - day sensibilities of the Buffy characters in the medieval - like world of Game of Thrones. Buffy's friends might introduce new ideas about equality and such in a world where the social hierarchy is so rigid. And on the other hand, the Buffy characters would have to adapt to the harsh realities of a world full of war, betrayal, and dragons. This cultural exchange adds depth and humor to the fanfiction.
Character development is another great aspect. In these crossovers, characters from both universes often have to step out of their comfort zones. Percy might have to deal with the more cut - throat and modern world of the Avengers, while the Avengers have to understand and accept the existence of magic and gods. This forces them to grow and change in new ways, which is always exciting to read about.
One of the most interesting pairings could be Giles and Doctor Strange. Both are well - versed in the ways of magic, though from different universes. They could exchange knowledge about different spells and artifacts. And then there's Spike and Black Widow. Spike has his vampire charm and combat skills, and Black Widow is a master spy and fighter. Their interactions would be full of tension and sass as they work together or perhaps even compete a bit while fighting a common enemy.
The most interesting part is the power combination. Naruto's jutsus like Rasengan and his ability to use chakra combined with the superpowers of the Avengers like Thor's lightning or Hulk's strength create really exciting battle scenes.
The character interactions. When different universes cross over, seeing how characters like Iron Man interact with, say, characters from the Star Wars universe (in some really creative crossovers) is fascinating.
The character interactions. When Brooklyn 99 characters cross over with others, it's always exciting to see how they'll get along. For instance, if they cross over with a show like 'New Girl', seeing Jake's detective skills contrasted with Jess's more whimsical nature can be really engaging.
The most interesting part is seeing how Izuku's character adapts to different universes. For example, in a crossover with the Naruto world, Izuku might learn chakra control, which is very different from his own quirk - based abilities. It's like seeing a fish out of water in a new and exciting environment.
In many 'thundercats crossover fanfic', the new storylines that emerge are really cool. When they cross over with something like the Guardians of the Galaxy, the Thundercats' sense of honor and the Guardians' more laid - back attitude create a contrast that leads to interesting adventures. Also, the way the fanfic writers combine the powers and abilities of both sets of characters is exciting.
The combination of different mythologies. Buffy has its own set of vampires, demons, and magic, while Supernatural has a vast array of creatures. When these are combined, it creates a whole new world of possibilities.