In addition to the regular characters, there could be some original characters created for the fanfiction. For example, a new friend or a dealer (if the story goes in that direction, without promoting drug use in a positive way). These new characters could add more complexity to the story and help drive the plot forward, whether they are there to help Peter or cause more trouble for him.
Well, of course, Peter Parker himself is the central character. His aunt May often plays an important role as she has to deal with the new situation of Peter being unmasked and the potential danger it brings to their family.
Obviously, Peter Parker himself is the main character. His friends like Ned Leeds and MJ might also be involved. They could be the ones trying to calm him down during his tantrum or be the cause of his distress in some cases.
Well, obviously Peter Parker and Tony Stark are the main ones. Since it's about Peter in Stark Tower, Stark is usually there to mentor or interact with Peter in some way. Pepper Potts might also be involved, perhaps she's the one who arranges Peter's stay or gives him some tasks to do in the tower.
Obviously, Peter Parker is the main character. But often, we might also see characters like Mary Jane. She could be worried about Peter when he's under the building and might try to help in some way, like getting in touch with other superhero friends of Peter.
Another main character is Aunt May. In fanfiction, she could be a source of moral guidance for Superior Spider - Man. She might be concerned about the changes in Peter and try to bring back the old, more kind - hearted Peter. Her interactions with him can add a lot of emotional depth to the story.
Aunt May is another character that might be important in this type of fanfiction. She could be the one who instills the 'live and let live' values in Peter, or she could be the one Peter is trying to protect while adhering to these values. And then there are other superheroes from the Marvel universe that could make cameos or be part of crossovers, like Daredevil or Iron Man, who might interact with Peter based on his new philosophy.
Peter Parker and Tony Stark are the central characters. Then there's Rhodey, who is Tony's friend. In fanfiction, he can be like an uncle to Peter, showing him the ropes of the military side of things or just being there to offer advice. Morgan Stark, Tony's daughter in some storylines, can also be a big part. She and Peter can form a cute sibling - like relationship, with Peter looking out for her.
Another character could be Aunt May. She has always been an important figure in Peter's life. When he faints, she could be extremely worried and try to figure out what's wrong with him, perhaps even blaming herself for not taking better care of him.
Kakashi could also be an important character. He has a lot of experience and wisdom. When Naruto gets high, Kakashi might be the one to guide Naruto through this strange state, using his own past experiences and knowledge of different ninja techniques. And then there's Jiraiya. Given his relationship with Naruto, he would surely be involved, perhaps trying to use his own unique jutsu to help Naruto come back to normal.
Well, obviously Peter Parker and MJ are the main characters. But there could also be other characters like Aunt May who might play a role in the story. She could be the one to comfort MJ after Peter leaves or try to convince Peter to come back.