Black Widow would be an interesting choice too. Her combat skills and stealth abilities would be a fresh addition to the FGO world. She could team up with Assassin - class Servants and learn new ways of fighting from them. Also, her backstory and her ability to adapt to different situations could create some really engaging storylines when combined with the FGO universe.
I think Iron Man would be really interesting. His high - tech gadgets and intelligence would contrast with the more magical and historical elements of FGO. He could probably try to reverse - engineer some of the magical items in FGO using his scientific knowledge.
Definitely Venom and Spider - Man (if he's considered part of the Avengers in this fic). Since Venom has a history with Spider - Man, their interactions within the Avengers context would be super interesting. Spider - Man would be constantly on edge around Venom, while Venom might taunt him. Another interesting pair could be Venom and Iron Man. Iron Man would be trying to analyze Venom's symbiotic nature, and Venom would probably not like being treated like a science experiment.
I think Wolverine and Black Widow would make an interesting pairing. Wolverine's brute strength and regenerative abilities paired with Black Widow's stealth and combat skills would be a great combination. They could have some really cool fight scenes together, like taking on a group of bad guys in a dark alleyway. Wolverine could do the upfront slashing while Black Widow uses her acrobatic moves and gadgets to take out the enemies from different angles.
Storm and Thor would be an amazing pairing. Storm has control over the weather, and Thor is the God of Thunder. They could create some truly epic weather - related attacks together. Imagine them combining their powers to create a massive super - storm to take down a powerful enemy. Also, Jean Grey and Doctor Strange would be very interesting. Jean Grey's powerful psychic abilities and Doctor Strange's magic could lead to some really mind - boggling interactions. They could explore different dimensions of the mind and magic together, perhaps even finding new ways to use their powers in combination.
I think Loki would be really interesting. He's always the trickster in the Avengers world. In a crossover with Glee, he could use his magic to create some wild and wacky musical illusions. He might even try to take over the Glee club and turn it into his own little kingdom of chaos.
I think it would be Loki. In this crossover, Loki could use his trickery to manipulate the Twilight vampires. He might see them as a new tool to achieve his goals. He could pretend to be on their side and then turn on them when it suits him. His magic and cunning would add a whole new level of chaos to the story.
Batman would be the most interesting. He doesn't have superpowers like the Avengers, but he's still a formidable hero. His presence in their world would be like a wild card. He'd be constantly analyzing the Avengers and their enemies, and his dark, brooding nature would contrast with the more flashy and super - powered Avengers.
I think the Flash would be. His super speed is so unique and it would be fascinating to see how he interacts with the Avengers.
I think Hulk would be the most interesting. He's all about brute strength and smashing things. Facing Godzilla, he'd be like a tiny but very angry force against a huge monster. It would be a battle of the titans in a sense, and seeing how Hulk reacts to Godzilla's size and power would be really exciting.
Definitely Harry Potter and Spider - Man. Harry could teach Peter about the magical world, like how to use a broomstick. And Peter could show Harry how to use his web - slingers in a more creative way in combat. They're both young heroes with a strong sense of justice, so they'd get along well.
I think Naruto and Hulk would be an interesting pair. Naruto's positive energy and his ability to befriend almost anyone could have an impact on Hulk. Maybe he could help Bruce Banner control the Hulk better. And Hulk's raw strength combined with Naruto's strategic thinking in battle could make them a formidable team.