Another plot could involve the reaction of the other Avengers. They might be initially confused or even a bit worried about Tony's new look and abilities. But as he starts using them to their advantage, they come to accept and even rely on this new version of Tony Stark.
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.
The plot could involve Tony and Nebula going on an adventure to find a powerful energy source that was lost during the events of the Infinity War. Along the way, they encounter various alien species that try to stop them. Tony uses his quick thinking and Nebula her combat skills to fight through. In the end, they find the energy source and use it to power a new device that can protect Earth from future threats.
One idea could be a story where Tony discovers a hidden diary of Howard's that reveals secrets about his early inventions and the true motives behind some of his actions. This could lead to Tony having a new perspective on his father and his own work.
One idea could be that Tony Stark is brainwashed by a powerful enemy. This enemy uses some advanced technology to manipulate his mind, turning him into a villain who starts attacking his former allies. He might use his Iron Man suits in new and devious ways against the Avengers.
A plot idea could be that a deaf hacker tries to break into Stark Industries' systems to prove a point about security flaws. Tony catches them but is intrigued by their skills. They start working together to improve security, with the deaf hacker using their unique observational skills. Another idea is that a deaf artist creates a piece inspired by Tony Stark, and he is so moved that he invites the artist to his tower. There, they face a threat together, and the artist's deafness becomes an unexpected advantage in outwitting the enemy.
One idea could be that Deadpool gets accidentally teleported into Stark Tower. He then proceeds to annoy Tony Stark with his non - stop chatter and crazy antics. Stark, at first, is irritated but then realizes Deadpool's skills could be useful in a new project he's working on.
Maybe the fanfiction could be about Tony adopting a child with special powers. He has to protect the child from those who would misuse the powers while also helping the child understand and control them. This could involve lots of action scenes and emotional bonding between Tony and the adopted child.
A great plot could involve deaged Tony getting involved in the early days of Stark Industries. He might see things from a new perspective and try to change the company's direction towards more ethical practices right from the start. This could lead to all kinds of adventures as he tries to convince the adults around him to listen to him. He could also form unexpected friendships with employees who later become important in the 'grown - up' Tony's life.
In a fanfiction, perhaps Nebula saves Tony Stark's life during a space battle. Tony, being the brilliant mind he is, then decides to create a new weapon or technology with Nebula's help. They bond over their shared experiences of survival and their determination to protect the universe. Their relationship could grow from mutual respect to a deep friendship as they face various challenges.
One common theme is survival. Given their experiences in space and facing tough situations, many fanfictions focus on how they rely on each other to stay alive.