She can be developed through her relationships. For example, her relationship with Tony could start off rocky as they get to know each other. She might be angry at him for not being there during her childhood. As they interact more, she could learn about his good intentions and they could grow closer.
One way to develop her character is to explore her internal struggles. She might be torn between the normal life she had before finding out about Tony and the exciting but dangerous world of superheroes. She could struggle with the fear of losing her new - found family, like Tony and the other Avengers, just as she found them.
Well, perhaps Buffy grows up without knowing her father is Tony Stark. She gets involved in some superhero - like situations in her own world. Then, through a series of events like a common enemy or a scientific discovery, they cross paths and the truth about their relationship is revealed. And from there, Tony starts to mentor her, sharing his knowledge of technology and combat strategies.
You can start by giving her a distinct personality. For example, if she's more like Tony, she could be humorous and quick - witted. If she takes after Ziva, she might be more serious and focused. Then, give her some goals or dreams. Maybe she wants to follow in her parents' footsteps but in a different way, like using modern technology to solve crimes. Also, show her relationships with other characters, such as her grandparents or her parents' friends.
One interesting plot could be the daughter suddenly showing up at Stark Tower. She might have grown up in secret, perhaps because her mother wanted to protect her from the dangerous world that Tony Stark is often involved in. She then has to navigate her newfound relationship with her father and all the high - tech and superhero craziness that comes with it.
Another aspect of their development could be through cultural exchange. Harry could introduce Tony to the wizarding culture, like the significance of Hogwarts houses and Quidditch. Tony could introduce Harry to the world of superheroes and their code of ethics. This exchange could lead to changes in their personalities. Harry might become more confident in the non - magical world, and Tony could become more open - minded towards things that science can't explain.
Well, it could make her overly independent. Since she's being neglected by Tony Stark, she might learn to rely only on herself. She'll grow up faster, taking care of her own needs and making her own decisions without much guidance from her father.
Loki might interact with her in a rather mischievous way at first. He could play little tricks on her just to see her reaction, but also be secretly impressed by her intelligence, which she got from her father. For example, he might magically move her tools while she's working on a project, and then be amused when she quickly figures out how to get them back using her own smarts.
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.
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.
A slow - burn relationship development could be interesting. They begin by sharing their knowledge. Wanda teaches Tony about her magic - like powers and their origin, and Tony shows Wanda the inner workings of his advanced technology. As they spend more time together, they realize they have a lot in common in terms of their sense of responsibility.
He might become more power - hungry. Usually, he is a hero, but with the goal of taking over the world, he could lose some of his moral compass.