She could be kidnapped by a villain who wants to use her as leverage against Tony Stark and the Avengers. So the Avengers have to work together to rescue her. During the rescue mission, they discover some new abilities she has that she didn't even know about herself.
Since he might be related to Tony Stark, there could be an emotional connection for the other Avengers. They might feel a sense of obligation to protect him or guide him, which changes their group dynamic. For example, Captain America might take on a more father - figure role towards Peter. Also, his presence could create some jealousy or competition among the Avengers who want to be his mentor or closest ally.
One popular storyline could be the OC being a brilliant scientist who catches Tony Stark's eye during a Stark Expo. They start collaborating on a new project, and along the way, romantic feelings develop. Another might be the OC having a special power that she hides from the world until Tony discovers it by accident, leading to an adventure where they learn to trust each other. And there could also be a storyline where the OC is from a different dimension and Tony has to figure out how to send her back, but in the process, they fall in love.
The OC can be unique by having an extraordinary talent. For example, she could be a master of an ancient martial art form that Tony has never seen before. This would not only make her stand out physically but also add an element of mystery to her character. Another way is to give her a very distinct personality trait like extreme shyness or being overly confident in a quirky way that contrasts with Tony's own personality.
In a Tony Stark Avengers toy fanfiction, imagine the toys are actually miniaturized versions of the real heroes. Tony Stark's toy is the most advanced. It can repair the other toys when they get damaged. A villain tries to steal the Stark toy to reverse - engineer its technology for evil purposes. The other toys, with the leadership of the Stark toy, must fight to protect themselves and the world from this threat.
Yes, it's possible that Tony Stark, as a character, could be the subject of Avengers fanfiction that he might 'watch' in the sense of being a character within the fictional scenarios written by fans. However, in the official Marvel universe, there's no indication of him actually reading Avengers fanfiction.
Hidden Midgard in a Tony Stark Avengers fanfiction could be a really cool concept. It might be a parallel dimension of Earth that has a connection to Asgard or some other alien realm. Tony Stark, with his curiosity, might be the first to suspect its existence. He could then use his Iron Man suit and all his tech gadgets to find a way to access it. Once there, he might find new allies or enemies, and this discovery could change the course of the Avengers' battles and their overall story.
Well, I really like the fanfiction 'Tony Stark's Ultimate Sacrifice'. It's a heart - wrenching story where Tony has to make a huge sacrifice to save the Avengers and the world. The way it's written really captures the essence of his character. 'Avengers: Tony's Clone Dilemma' is also quite engaging. Here, a clone of Tony is created and the Avengers have to figure out if it's friend or foe. It plays with the idea of identity and loyalty. And 'The Iron Man and the Alien Alliance' is a story where Tony teams up with an alien race to help the Avengers in a fight against a common enemy. It has some really cool alien technology and battle scenes.
The concept of Tony Stark as a cat in a fanfic can also bring out different aspects of his personality. Cats are often seen as independent, which is a trait that Tony already has. But as a cat, it could be exaggerated. He might be more aloof and choose when and who he wants to interact with among the Avengers. This could create some tension or just more light - hearted moments as the other Avengers try to figure out what the cat - Tony Stark is thinking or wanting.
They would be all over him! Steve would probably have a big, warm smile on his face and just be in awe of how small and precious he is. Clint would make silly faces to make the baby laugh. Bruce might be a bit more cautious at first, but then he'd be charmed by Peter's little giggles.