Wade is the central figure here. Alongside him, we could have Clint Barton's family members as they are part of the Avengers world. His wife and kids could be involved, and Wade might have some interesting interactions with them. Maybe he tries to teach Clint's kids some of his unorthodox combat moves, much to Clint's dismay.
Obviously, Wade would be one of the main characters. And then there would be the parents of the Avengers. For example, Thor's father Odin (if he's still alive in the context of the fanfiction), or Tony Stark's father Howard Stark if he were to be involved in some sort of flashback or time - travel scenario.
The main characters are Peter and the Avengers. But we might also see some side characters like Happy Hogan who could be involved in some way. Maybe he's the one who arranges the initial meeting between Peter and the Avengers. And Pepper Potts could also make an appearance, giving her take on Peter's presence in the Avengers' world.
Obviously, Robin would be one of the main characters. And then, of course, the Avengers members like Iron Man, Captain America, Thor, etc. would be there as well.
In this fanfiction, Wade might make a total chaos when meeting the Avengers' parents. He could crack inappropriate jokes that leave everyone either shocked or in stitches.
Obviously, Batman himself would be one of the main characters. And of course, his parents, Thomas and Martha Wayne. There could also be Alfred, as he is an important figure in Batman's life and might play a role in facilitating the meeting or providing some insights afterwards.
Obviously, Ant Man himself would be one of the main characters. And then, of course, the core Avengers like Iron Man, Captain America, Thor, Hulk, and Black Widow are likely to be there too. They are the mainstay of the Avengers and would be natural counterparts for Ant Man to interact with.
Obviously, Natsu himself would be one of the main characters. His parents, whose identities are likely to be revealed in the fanfiction. There could also be his friends, like Lucy, Gray and Erza. They might be there to support Natsu during this emotional encounter or play a role in helping him find his parents.
Obviously, the Avengers like Iron Man, Captain America, Thor etc. would be main characters. And Loki's children, whoever they are in the fanfiction's interpretation. Maybe there would be a new character created specifically for this story as well who becomes important in the interactions between the two groups.
Obviously, fem Naruto herself is a main character. Her father, Minato Namikaze, and her mother, Kushina Uzumaki, are the ones she is going to meet. There might also be other characters from the Naruto universe like Jiraiya, who was Minato's teacher and could potentially be involved in the story, perhaps as someone who helps facilitate the meeting.
Obviously, Spike is one of the main characters. His parents would be the other important characters. And depending on the plot, Twilight Sparkle or some of Spike's other friends in Ponyville might also be involved, perhaps as moral support for Spike during the meeting.
In this fanfiction, Kid Goku is a given. His parents are the central focus of the meeting. However, we could also see other Saiyan characters. Maybe some Saiyan elders who knew his parents well and can provide more context about Goku's family. Additionally, Master Roshi could be included. He has been an important figure in Goku's life, and his reaction to Goku meeting his parents could add an interesting dynamic to the story. There could also be villains who try to disrupt the reunion, adding some action and conflict to the fanfiction.