There could be new characters introduced as well. Maybe some ancient beings who have a connection to the creation of the Infinity Stones. They could either guide Tony or try to stop him from meddling with powers that are beyond human understanding. Additionally, some villains might emerge, attracted by Tony's new - found interest in the Infinity Stones and aiming to steal them from him.
Doctor Strange would be a likely character. Given his knowledge of the mystic arts and the Infinity Stones, he could either be an ally or a rival to Tony. And of course, the other Avengers might be involved too. They could be either helping Tony or trying to stop him if they think he's going too far with his Infinity Stone experiments.
Pepper Potts would probably be involved. She might be worried about Tony's new obsession with the Infinity Stones and try to keep him grounded. Happy Hogan could also be there, providing some comic relief and practical support.
Well, perhaps the plot could involve Tony Stark's quest to collect all the Infinity Stones for some noble purpose. Maybe he wants to use their power to prevent a greater threat to the universe than Thanos ever was.
Well, Nebula herself is likely to be one of the main characters interacting with him. They might have some interesting conversations about the technology they both use or their experiences in space.
Obviously, Tony Stark is the central character. But often, you'll also see characters like Pepper Potts. She might be the one who tries to pull Tony away from his gaming sessions to deal with real - world business or she could support his gaming - related projects. Another common character is Rhodey. He could be Tony's gaming partner or the one who challenges him in virtual combat scenarios.
The main character is Tony Stark. In many of these fanfictions, Jarvis (or his later forms like Friday) can be a significant character. Since Jarvis was always with Tony in his tech - filled world, in a second - chance story, Jarvis could provide different kinds of advice or assistance. Additionally, villains from the Marvel universe might also be involved if the story is about Tony getting a second chance to defeat them more effectively.
One group that could be the kidnappers are AIM (Advanced Idea Mechanics). They're always interested in getting their hands on advanced technology, and Stark has plenty of that. The Ten Rings terrorist organization is also a possibility. They've targeted Stark before and kidnapping him again would be a way to make a big statement. And let's not forget some rogue elements within S.H.I.E.L.D. who might think that Stark is a threat and kidnap him to keep him in check.
One common character paired with him is Bruce Banner. They could be gaming buddies, with Bruce using his scientific knowledge to help Tony improve his games or vice versa. Another is Pepper Potts. She might be shown as someone who tries to get Tony to take a break from his intense gaming sessions.
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 option could be a tech - savvy human who has developed a device to control mutants. He believes that mutants are a threat to humanity and wants to subjugate them. He targets Jean Grey first because of her great power. Tony Stark, being a friend of Jean's and a lover of freedom, teams up with her. Stark tries to hack into the control device while Jean Grey uses her powers to resist the control and fight back against the villain.
His parents, Howard and Maria Stark, are very common. They play important roles in shaping Tony's childhood. Jarvis, the family butler, also often appears. He could be the one to encourage Tony's scientific pursuits or keep him out of too much trouble.
The Princesses, Celestia and Luna, are likely to be part of it. They might be the ones with the knowledge or power to help Twilight. Celestia could offer her wisdom on how to control this new and dangerous ability, while Luna might use her connection to the night and dreams to figure out if Twilight is under some sort of spell.