Often, the fanfictions involve Tony relying on his network of contacts. He might call in favors from other scientists or even some minor characters from the Marvel universe. There's also the aspect of him sacrificing something, like his own safety or his reputation, in order to save the Avengers. And of course, there are epic battle scenes where Tony uses his Iron Man tech to fight off the enemy and protect his teammates.
One popular 'Tony Stark saves the Avengers' fanfiction is 'Stark's Redemption'. In this fic, Tony uses his brilliant mind and advanced technology to rescue the Avengers from a powerful and mysterious enemy. He creates new gadgets on the fly and outsmarts the foe.
One common theme is loyalty. Peter feels a deep loyalty towards Tony as his mentor and friend, and this drives him to save Tony in these stories. For example, in many fanfictions, Peter will risk his own life without hesitation when Tony is in danger.
Well, one possibility is that the girl could be in danger from some villains. Tony Stark, being the hero he is, swoops in with his Iron Man suit. Maybe she's running from a group of bad guys who are after her for some secret she holds. Tony spots her while flying by and uses his repulsors to fend off the attackers, then takes her to safety.
In a 'Percy Jackson Saves Tony Stark' fanfiction plot, Stark could be on a mission in a remote area that has some hidden mythological secrets. He unknowingly awakens an ancient evil. Percy Jackson, who is nearby on a quest of his own, notices the disturbance. He races to save Stark. Percy has to deal with his own personal demons as well as the new threat. He saves Stark by using his demigod powers in creative ways, like using the water in the environment to create shields or using his ability to read ancient languages to decipher a way to stop the evil. After that, they join forces to make sure the area is safe again and Stark is inspired by Percy's world to create new tech that can detect and deal with mythological threats.
One possible plot twist could be that Kraglin saves Tony, but it turns out Tony was set up as bait by a powerful enemy. So, instead of being out of danger, they are now both in the crosshairs of an even greater threat.
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.
One idea is that the Tony Stark Avengers toy is a prototype for a new type of weapon in the Avengers universe. The bad guys get wind of it and try to steal it. The other Avengers toys, with Tony Stark at the helm, have to protect the prototype. They use their unique toy - like abilities, like the Hulk toy's super strength and Captain America's shield - throwing ability of the toy version, to fend off the attackers.
Maybe the story could be about her growing up in the shadow of her famous father. She struggles with the expectations of the world and the Avengers. But then she discovers a unique power within herself that has nothing to do with technology. With the help of the remaining Avengers, she learns to control this power and becomes a hero in her own right. For example, she might have a power related to energy manipulation that she initially fears but later embraces.
On the other hand, it could also lead to new opportunities for character development among the remaining Avengers. They may be forced to step up and fill the gaps left by Tony. For example, someone else may have to take on the role of the tech - savvy member, which could bring out new skills and relationships within the team.
A good 'Tony Stark and Avengers fanfiction' often has a strong characterization of Tony. It should capture his intelligence, his sarcasm, and his self - sacrificing nature. For example, if the story shows him using his genius to solve a complex problem that the Avengers are facing, it's on the right track. Also, a good plot that involves the entire Avengers team is important. It could be a new threat they have to face together or an internal conflict within the team that Tony has to help resolve.