Another character that Aang might interact with is Apollo. Apollo is associated with many things like music, archery, and prophecy. Aang, being a well - rounded individual, could be interested in Apollo's skills. They could have a friendly competition, for instance, in archery. Or Aang could learn something about prophecy from Apollo, which could be useful for his future adventures.
Well, it could be that the Olympians introduce Aang to their own powers and magic. For example, Zeus could show him how to control lightning in a different way than Aang has seen before. Aang might also befriend some of the Olympians, like Hermes, and they could go on adventures together across different realms. This could lead to some interesting cultural exchanges between the two fictional universes.
Well, Hancock is bound to interact with Usopp. Usopp could be showing off his new inventions to her, and she might be either impressed or unimpressed. And of course, Hancock will have to deal with Luffy's right - hand man, Zoro. Zoro might be a bit guarded around her at first, but they could end up having some interesting conversations about strength and honor. Also, Hancock and Chopper could have a really cute interaction where Chopper tries to understand Hancock's love for Luffy from a medical or psychological perspective.
Obviously, Peggy and the Avengers are the key characters. Among the Avengers, Captain America would be a central figure in the interaction as he and Peggy have a pre - existing relationship.
Probably Ash and Iron Man. Iron Man is always curious about new things and Ash with his Pokémon would be quite an interesting sight for him. He'd likely approach Ash first to ask questions about what he is and what those strange creatures are.
In this fanfiction, Penny Parker would surely interact with Thor. Thor could share his stories of Asgard with her, and Penny might be in awe of his godly powers. Also, Hulk could be an interesting character for her to meet. Maybe she'd try to find a way to calm the Hulk down when he gets angry. And Black Widow would be another key character. Black Widow could train Penny in espionage and hand - to - hand combat skills.
Spyro and Twilight Sparkle would be likely to interact. Twilight is very intelligent and well - versed in magic, and Spyro has his own dragon powers. They could learn from each other. For example, Twilight could study Spyro's dragon magic, and Spyro could learn about the complex magic system in Equestria from Twilight.
It could be Percy and Black Widow. Natasha is a master of reading people, and she'd notice Percy right away. She might approach him in a more stealthy way compared to the others, trying to assess if he's a threat or an ally. And Percy, being used to danger, would be on his guard at first, but then start to trust her as she shows her good intentions.
Yang from RWBY might interact with the female characters from other Rooster Teeth shows. Yang is strong - willed and confident, and she could share her combat experiences with them. At the same time, she could learn new ways of handling different situations from these characters. For example, if she meets a character who is more strategic and less about brute force, it could be an eye - opener for her.
Naruto and Aang would be the most obvious ones. They are the main characters in their respective worlds.
Definitely Geo Stelar from Megaman Starforce and X from Megaman X. Geo has his own set of skills and X is iconic in his series. They would be the natural leaders to start interactions between the two groups.