I think Steve Rogers and Will would get along well. Steve is all about honor and doing what's right, and Will has a strong moral compass as a healer. They would probably respect each other's values.
I think Iron Man and the Flash would get along well. Iron Man is always interested in new technology and the Flash's super - speed abilities are like a form of amazing technology. They could have long discussions about how the Flash's powers work and Iron Man might even try to create something inspired by it.
I think Annabeth from Heroes of Olympus and Bruce Banner (The Hulk) could get along. Annabeth is super smart and strategic, and Banner is a brilliant scientist. They could exchange knowledge about different fields like Annabeth's knowledge of architecture and ancient history and Banner's scientific research.
I think Captain America would be a likely ally. Captain America is all about justice and doing what's right, which aligns well with Gohan's values. They both have a strong moral compass and would respect each other's fighting abilities.
I think Red Hood and Hawkeye could be likely allies. They both have a certain level of street - smartness. Hawkeye is used to working in the shadows and using his skills without relying too much on superpowers, just like Red Hood.
Black Widow would be a likely ally. They both have a background in street - level combat and stealth. They could work together on a mission that requires infiltration and taking down enemies quietly. Their skills would complement each other well, with Daredevil's enhanced senses helping to detect hidden threats and Black Widow's combat training and espionage experience being crucial in executing the mission.
Captain America could be a strong ally for Nightwing. Captain America is a great leader and has a strong sense of justice. Nightwing, coming from Gotham, also has a deep - rooted sense of right and wrong. They could lead the Avengers together in a battle, with Captain America providing the strategic leadership and Nightwing using his agility and combat skills to execute the plans on the ground.
I think Steve Rogers would be a likely ally. Steve is all about justice and doing what's right, and Castiel has a similar sense of duty in his own way. They could bond over their strong moral compasses.
Hulk might be an interesting one too. Sonic's speed could either annoy or amuse Hulk. If they end up on the same side, Sonic could use his speed to lead Hulk towards the enemies. And Hulk's raw strength could be something Sonic would be in awe of. They could have a really unique dynamic, like a fast - moving pest annoying a big, strong giant at first, but then they become an effective team.
Well, they could team up to fight a common enemy. Maybe the Avengers are facing a magical threat and Solangelo's skills in the magical realm come in handy.
Thor might be a great ally for Jack Frost. Thor is used to dealing with magic and powerful beings from different realms. He would be less likely to be intimidated by Jack Frost's powers. They could both use their elemental - related powers (Thor with lightning and Jack Frost with ice) to create powerful combined attacks against their enemies. For example, Thor could strike his lightning into Jack Frost's ice structures, creating a powerful blast of energy.