Toad and Blake could form an alliance. Toad is small but mighty, and Blake is stealthy. They could work together in reconnaissance missions. Toad could use his speed to quickly gather information, and Blake could use her cat - like senses and stealth to move around undetected and protect Toad if they are discovered.
Ruby and Church could form an alliance. Ruby is always eager to make new friends and fight for what's right. Church, despite his snarky attitude, has a good heart deep down. They could bond over their leadership roles in their respective teams and share their knowledge about combat and strategy.
Ruby would be a likely candidate. She is the leader of Team RWBY and has an open - minded nature. She would be able to see beyond Godzilla's initial appearance as a threat and might try to communicate with it. Yang, with her fearless attitude, could also be part of the alliance. She is not afraid to face powerful opponents and would be willing to fight alongside Godzilla if it means protecting the world. Blake, given her experience with different species and her ability to empathize, could also be part of the group that tries to form an alliance with Godzilla.
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 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.
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.
Leonardo and Piccolo could form an alliance. Leonardo is a natural leader and very disciplined, which Piccolo can respect. Piccolo, with his strategic mind and powerful abilities, would be a great ally for Leonardo in battles. They could work together to plan attacks against their enemies, like when facing a powerful villain that has both ninja - like stealth and superhuman strength.
Ruby. She has a very open - minded and empathetic nature. She would likely be the first to try and reach out to the Arkham Knight, believing that there is good in everyone. She might see his skills and think that, if redirected, he could be a great asset in fighting the Grimm.
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.
Sasuke and Duncan might form an alliance. They both have a bit of an edgy and brooding personality. They could respect each other's skills. Sasuke's ninja skills in combat and Duncan's street - smart and tough - guy attitude would make them a formidable pair in any challenges they face in the crossover.
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.