One common theme is living up to their father's legacy. Since Tony Stark was such an iconic figure, his kids often struggle with the expectations. Another theme is dealing with the fame and wealth that comes with being a Stark. For example, in many fanfictions, they have to figure out who their real friends are.
Well, there's a fanfiction called 'Stark Kids: Their Own Path'. In this story, Tony Stark's kids are trying to make their own mark in the world, separate from their father's shadow. They use their skills and knowledge in unique ways. Also, 'The Stark Heirs' is quite interesting as it delves into the relationships between the kids and how they support each other in the face of various challenges.
One common theme is identity. The sister has to figure out her own identity within the shadow of her famous brother. For example, in some fanfictions, she struggles with whether to use the Stark name to her advantage or make her own name independently. Also, the theme of loyalty comes up a lot. Whether it's loyalty to family, to friends, or to a cause, it plays a big part in these stories. For instance, the sister might be loyal to Tony even when his actions are controversial. And of course, the theme of heroism. The sister could be a hero in her own right, saving the day alongside Tony or in her own unique way.
One interesting Tony Starks fanfiction story could be about him creating a new type of AI that has emotions. In this story, the AI becomes like a child to him and he has to teach it right from wrong. Another could be a time - travel fanfic where Tony goes back in time to prevent some of the disasters that happened in the MCU. There are also those that focus on his relationships, like a fanfic exploring his friendship with Rhodey in more depth.
A common theme is family. The relationship between Tony and his niece is often explored, like how he takes on a parental role. Another theme is adventure. Since she's related to Tony Stark, she usually gets involved in some exciting Avengers - related adventures.
Another theme is secrecy and betrayal. Since it's an affair, it's often hidden from others, and when it's discovered, it can lead to a lot of drama. Fanfictions play with this idea of how the characters react to the betrayal or the revelation of the secret relationship.
Well, it could be a fan - made concept where it's like a place in the fanfiction world created by fans of Tony Stark. It might be a home or a hub for genius - level characters in the stories inspired by Tony Stark's universe.
There could be characters from Tony's past as well. For example, Obadiah Stane might be mentioned or even be a part of some backstory. If the fanfiction delves into the family history, there could be appearances of their parents in flashbacks. And don't forget Rhodey. He could be a great influence on the baby sister, teaching her about military values or just being a cool older friend.
You can start by searching on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Tony Starks' in the search bar and you'll get a whole list of stories. You can also look for fanfiction communities on social media platforms like Reddit. There are often threads dedicated to sharing and discussing Tony Starks fanfiction.
In this fanfiction, the plot might involve the daughter inheriting Tony's intelligence and technological skills. She could be a prodigy in her own right, building her own gadgets in secret. When Tony finally discovers her existence, he's both proud and worried. There could be a conflict with other characters who either want to protect the daughter or use her abilities for evil purposes. And as the story progresses, she might join forces with the Avengers or form her own team to fight against the bad guys.