One great 'Tony Stark daughter fanfic' is 'The Stark Heir'. It shows the daughter's journey as she tries to live up to her father's legacy in the world of technology and superheroes. She has to face many challenges and enemies who target her because of her relation to Tony Stark.
Pepper Potts could be a common character. She might be in a position where she tries to mediate between Tony and his unwanted daughter, either trying to get Tony to be more accepting or helping the daughter understand Tony's perspective.
Love and friendship are also common themes. Her relationships with friends at school or in the superhero community, and her romantic interests if any, are often explored. It gives a more well - rounded view of her character as not just a Stark, but also a young girl growing up in a complex world.
One popular type of fanfiction could be about Tony Stark's daughter joining the Avengers. Maybe she inherits his genius and creates her own high - tech suit. She might struggle at first to be accepted by the existing Avengers, like Iron Man did. But through her skills and determination, she gradually wins them over and becomes an important part of the team.
The plot should be engaging. It could involve her dealing with villains who target her because of her father. Or it could be about her trying to make a name for herself in the superhero world. Another aspect is the integration of the existing Marvel universe. References to other Avengers and events make the fanfic more immersive.
Another idea for this fanfiction could be that Tony Stark's daughter starts as a sort of 'Avengers - in - training'. She is constantly trying to prove herself to the established members. There could be a lot of action - packed scenes where she is in dangerous situations but manages to use her wits and any skills she has learned from her father to get out of them.
In a time travel fanfiction involving Morgan Stark, perhaps she travels back in time to a crucial moment in her father's life, like the battle of New York. She uses her knowledge from the future to help him, but also has to be careful not to disrupt the timeline too much. Morgan might end up forging a new bond with her father that was different from the one she had in her own time.