Iron Man could be the most important. His intelligence and resources are unrivaled. In a reunion, he'd be the one to come up with the high - tech strategies and gadgets needed to face the new threats. Plus, his character arc and growth over the years have made him a central figure, and his return in a reunion would surely have a big impact on the story.
Captain America would be very important. He has always been the moral compass of the Avengers. His leadership skills and ability to bring the team together would be crucial in a reunion. He can bridge the gaps between different members, whether it's Iron Man's tech - based thinking or Thor's more otherworldly approach.
Captain America's protege would be an interesting choice. He has big shoes to fill, and seeing how he has developed in the absence of Captain America would be engaging. He might struggle with living up to the legacy, but at the same time, he could bring his own unique style and leadership to the group during the reunion. His relationships with the other young Avengers, especially those who knew Captain America well, could be a major part of the story.
However, it might also be one of the Avengers. For instance, Iron Man could be important as he has the closest connection to Jarvis in the original lore. His relationship with Jarvis, both in the fanfiction and in the general Marvel universe, could drive the plot forward, especially if there are elements related to his father, Howard Stark.
Scarlet Witch could be the most crucial. If she is written to fully realize and control her powers earlier. She could single - handedly take on Thanos and his army. Her reality - warping abilities could be used to not only defeat Thanos but also to restore all the damage he had done across the universe without the need for complex time - travel plans.
It could be Harry Styles. Since he has had a very successful solo career, he might be the one who initiates the reunion, using his influence and popularity to bring the boys back together.
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.
One of the most interesting interactions would be between Harry and Black Widow. Black Widow is a master of espionage and combat, and Harry has his own set of skills from his years of fighting dark wizards. She could teach him some combat moves without magic, and he could show her some magical defenses. Also, the interaction between Ron and Hawkeye could be fun. Ron with his sometimes clumsy but brave nature and Hawkeye with his precision and focus. They could learn from each other's strengths while also having some humorous moments.
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.
Deadpool and Iron Man would be really interesting. Iron Man is all about high - tech and calculated moves, while Deadpool is wild and unpredictable. They could have some great banter, like Deadpool making fun of Iron Man's suits or Iron Man trying to get Deadpool to follow some sort of plan.
Sasuke and Black Widow. Both are complex characters with a dark past. They could bond over their experiences of loss and redemption. Black Widow might be able to teach Sasuke some new combat techniques, while Sasuke could show her some of his ninjutsu skills. It would be interesting to see them on a stealth mission together.
Eggsy and Iron Man would make a great pair. Eggsy is a bit more rough - around - the - edges and from a different background, while Tony Stark is a genius billionaire. They could bounce off each other with their different perspectives. Eggsy might be in awe of Stark's technology at first, but then start to contribute his own unique ideas, and Stark could be amused and intrigued by Eggsy's street - smart solutions to problems.