It could be Naruto and Thor. Thor comes from a different world and has his own set of powers related to lightning and strength. Naruto also has his own unique power source in the form of chakra. They both have a warrior - like spirit. Thor would respect Naruto's power and Naruto would be in awe of Thor's god - like abilities. This mutual respect could lead to them forming an alliance first in the fanfiction.
Probably Naruto and Iron Man. Iron Man is always interested in new technology and abilities. When he sees Naruto's unique ninja abilities, especially the jutsu like Rasengan which is like a concentrated energy attack, he would be intrigued. Naruto, on the other hand, would be interested in Iron Man's high - tech gadgets. So they would start an alliance based on mutual curiosity and the potential of combining their skills.
It could also be Annabeth and Black Widow. Both are highly intelligent and strategic. Annabeth's knowledge of architecture and ancient languages might be useful to Black Widow in certain situations, like deciphering an ancient code related to a new threat. Black Widow, in turn, could teach Annabeth some self - defense and espionage skills. They would see the value in each other's abilities and form an alliance quickly.
Another possibility is that Tony Stark and Nami would be the first to start an alliance. Nami is always interested in valuable things, and Tony has a lot of high - tech gadgets. They could start a business - like relationship at first, with Nami being intrigued by Stark's technology and Stark being impressed by Nami's navigation skills and her ability to handle money. This could then lead to a full - fledged alliance between the two groups.
I think Hamilton and Captain America would be likely to form an alliance. They both have strong beliefs in justice and freedom. Captain America fought for his country in a different time, and Hamilton was a key figure in the American Revolution. They could understand each other's values and work together towards some common goals, whether it's about protecting the people or promoting certain ideals.
I think Naruto and Ruby would be likely to form an alliance. Naruto is always eager to make friends and help others, and Ruby has a similar kind of positive, can - do attitude. They both lead their respective teams in their own universes, so they would understand each other's leadership roles and could work well together.
I think Captain America from the Avengers would be one of the first to consider an alliance. He's all about justice and protecting the world, and when he sees the SG1 team's efforts in exploring and protecting the galaxy, he would recognize their similar goals. Also, Daniel Jackson from SG1 is very open - minded and interested in different cultures and people, so he would be quick to see the potential in teaming up with the Avengers.
I think Yugi and Captain America would be likely to form an alliance first. Yugi is a kind - hearted and brave character, and Captain America is all about justice and leadership. They would recognize these qualities in each other quickly and start to work together to face the challenges in the crossover situation.
I think Harry Potter and Captain America would be likely to form an alliance. Harry is a natural leader who has faced great evil in his world, and Captain America is all about justice and doing what's right. They would respect each other's values and leadership skills. They could lead their respective teams, the Hogwarts students and the Avengers, in the fight against the common enemies like Voldemort and Thanos.
Sasuke and Stealth Elf. Sasuke is a skilled and somewhat brooding character, and Stealth Elf's stealth abilities would complement Sasuke's own combat skills well. They could work together in a more stealth - based mission in a fanfiction, like infiltrating an enemy base.
Iron Man would be a likely candidate. Tony Stark is known for his sense of humor and ability to tolerate eccentric personalities. He might see Deadpool's skills and be interested in using him for certain missions, while also enjoying the banter.
Batman and Kakashi would be likely to form an alliance. They are both very intelligent and strategic. Batman is known for his detective skills and Kakashi is a highly skilled ninja. They could work together to figure out the motives of the villains in the crossover and come up with a plan to stop them. They would also respect each other's combat abilities.