One possible plot twist could be that Peter's real identity as Spider - Man is revealed to Tony in a very unexpected way. Maybe during a fight against a common enemy, Peter's powers malfunction and he has to expose his identity to save Tony. Another could be that Tony's enemies try to use Peter against him once they find out about the adoption. For example, they kidnap Peter to blackmail Tony into giving up some important technology.
A plot twist might be related to Peter's family. Perhaps there are some secrets about his parents that come to light because of his adoption by Tony. It could turn out that his parents had some connection to Tony's past that neither of them knew about. Also, there could be a twist where Peter starts to have strange dreams or visions that are related to his new family situation with Tony, and these visions lead him to discover something important about his future or his role in Tony's life.
Well, it could be that Tony has some ulterior motives for adopting Peter that are not clear at first. Maybe he's trying to groom Peter to be his successor in a much more complex way than just being a father figure. Or there could be a plot twist where an old enemy of Tony fakes being related to Peter to get close to Tony and his resources. This would put Peter in a difficult situation as he tries to figure out who to trust and how to protect his new family.
One possible plot twist could be that Peter's identity as Spider - Man is revealed to the public much earlier than in the original story. Since Tony Stark is his adopted father, he has to use all his resources and influence to protect Peter from the various threats that come with this exposure. This could lead to a lot of interesting scenarios, like Stark having to face off against some of his own business rivals who might want to use Peter's powers for their own gain.
Well, one possibility is that Harry, who might be in a difficult situation in his own world, is suddenly whisked away to the Marvel universe. Tony Stark, seeing his potential or just feeling a connection, decides to adopt him. Harry could then be introduced to high - tech gadgets and superhero training, and he might use his own magical knowledge in unexpected ways in this new world.
Well, a plot twist could be that Harry's past with the Dursleys is revealed to Tony in a very dramatic way. Maybe some magical artifact from Harry's world that he brought with him accidentally shows Tony all the abuse and neglect Harry endured. This could lead to Tony becoming extremely protective of Harry and going after the Dursleys in his own way, using his resources and influence. Another twist might be that Harry has a hidden power that is only awakened when he is in the presence of Stark's advanced technology. This power could be something that even the wizarding world doesn't know about, and it could put Harry in a position where he has to choose between his two worlds. And then, there could be a plot twist where Tony's enemies target Harry to get to Tony, thinking that Harry is Tony's weak point, but in reality, Harry ends up being the one who saves Tony.
Their relationship could develop in a mentor - mentee way at first. Tony would teach Peter about science, technology, and how to be a better superhero. As time goes by, they would become more like father and son. Peter would start to look up to Tony not just as Iron Man, but as a dad. For example, they might have movie nights together or Tony would help Peter with his school projects.
One possible plot could be Loki, having lost his place in Asgard perhaps after some misdeeds, is found by Tony. Tony, being the genius with a big heart (underneath his playboy exterior), decides to take Loki in. Loki initially resists but gradually warms up to Tony's world of technology and Earthly comforts. They might team up to fight a common enemy, with Loki using his magic and Tony his high - tech gadgets.
Well, perhaps in the fanfiction, Tony kidnaps Peter because he believes Peter has some sort of secret that could endanger the world if it gets out. He might be trying to protect the world in his own, extreme way. And Peter is left confused and scared, having to figure out how to convince Tony he's on the right side.
Well, perhaps Tony has some sort of misunderstanding. Maybe he thinks Peter has betrayed him in some way, so he kidnaps Peter. But later, as he realizes his mistake, he tries to make it up to Peter.
Well, one possibility is that Tony could replace Peter in a mission. Maybe Peter gets injured and Tony steps in to finish what Peter started. It could also be about Tony taking over Peter's role in a social or school setting within the fanfiction world.
One possible plot twist could be that Hermione's magical abilities take on a new dimension under Narcissa's influence. Maybe she discovers a different kind of magic that the Malfoy family has secretly been practicing. Another could be that Hermione's relationship with the wizarding world at large changes. She might become more of an insider in the pure - blood society, which would cause a stir among her friends like Harry and Ron. Also, her academic pursuits could shift as Narcissa encourages her to study different areas of magic that are more in line with the Malfoy family's interests.
One possible plot twist could be that Harry discovers some hidden magical ability within himself that is related to his new family with Dean. Maybe it's a unique type of magic that only his new family line has.