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.
It shows his heroic side even more. He's always ready to jump in and save someone in need, which is a big part of his character. Saving the girl running makes him seem more approachable and caring, not just a tech - genius billionaire in a suit.
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.
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 possible plot could be that Tony Stark, while on a solo space exploration mission, stumbles upon the Ravagers. He initially has a tense encounter with them as they are skeptical of his motives. But then, they realize his tech can be useful. They team up to take on a common enemy, a powerful alien warlord who has been raiding planets for resources. Tony modifies some of his Iron Man tech with Ravager tech he discovers, creating a new and more powerful suit.
Well, perhaps the plot could start with Tony Stark coming across some ancient Norse texts about Jormungand while researching something completely unrelated. He then becomes obsessed with learning more about the Midgard Serpent. He might try to create a tech - based model of Jormungand to study its capabilities. As he delves deeper, he discovers some secrets about Norse magic that could potentially be applied to his technology, leading to a whole new level of Iron Man upgrades.
In one possible plot, Stark could be kidnapped by a powerful magical - technological hybrid villain. Fem Harry Potter, with her knowledge of both magic and her quick - thinking skills, tracks him down. She has to navigate through the unfamiliar high - tech world of the Marvel universe while also using her magic discreetly. Once she finds Stark, she uses a combination of spells and her own wits to defeat the villain and save him. This could also lead to an interesting friendship or partnership between them, with Harry teaching Stark a bit about magic and Stark introducing Harry to new technology.
Well, one way could be through magic. Harry Potter has a whole arsenal of spells. He could use a protection spell to shield Tony Stark from an incoming attack. Maybe Iron Man's suit malfunctions during a battle, and Harry, being in the right place at the right time, uses 'Reparo' to fix it.
Well, she might run away because she feels overshadowed by her father's fame. Everyone always talks about Tony Stark, Iron Man, and she may feel like she's just an afterthought. Maybe she wants to find her own identity away from the Stark name.
In this fanfiction, the plot might be centered around Tony's journey of self - discovery as a Greek demigod. He could start having strange dreams or visions related to Greek mythology. As he investigates, he realizes his true heritage. Along the way, he might have to choose between his life as a superhero in the public eye and his new life as a demigod, which has its own set of rules and responsibilities that he has to learn and abide by.