Well, in a fanfiction where Tony Stark survives Avengers Endgame, he would likely face some internal struggles. He has been through so much trauma, and even though he survived, he would have to deal with the psychological aftermath. However, his survival would also mean that he could help in rebuilding the Avengers in a more sustainable way. He might introduce new protocols and safety measures to ensure that the team never faces such a devastating loss again. He could also form stronger alliances with other superhero groups across the galaxy, using his charisma and intelligence to bring everyone together for a common good.
In a fanfiction where Tony didn't die, he could continue to be a mentor to the new generation of Avengers. He would use his genius intellect to develop even more advanced technology to protect the Earth. Maybe he'd finally have the time to focus on his family life with Pepper and their daughter, while still being involved in superhero affairs on a more strategic level.
If Tony didn't die in Avengers Endgame in a fanfiction, he might start a new initiative. He could create a school for young superheroes, similar to Xavier's School for Gifted Youngsters. This way, he would be able to train and guide the next wave of heroes. He would also collaborate with other brilliant minds in the Marvel Universe, like Shuri, to make technological breakthroughs for the betterment of all.
If Tony didn't die, the story would be drastically different. For one, the Avengers would still have his leadership and resources. His presence would change the dynamic during the post - Endgame events. They wouldn't be mourning his loss, but instead, be planning new strategies with him at the helm.
Perhaps they'll be so into the fanfictions that they'll try to incorporate some of the fictional elements into their real lives. For example, if there's a fanfiction where Tony has a unique way of powering up his suit, they could try to replicate it in a way that's applicable to their own tech. It could also strengthen their bond with Tony as they get more insights into his character through these fictional works.
One way could be through some kind of time - related magic. Maybe Doctor Strange finds a way to manipulate time even more precisely than he did in the movie. He could create a special time loop that spares Tony's life while still achieving victory over Thanos. Another possibility is that Pepper, using her own intellect and some Stark technology she's been secretly working on, manages to reverse the effects of the Infinity Stones on Tony at the last moment.
In this fanfiction scenario, Peter himself would likely go through a lot of changes. He might feel a new sense of pressure, knowing that he is now seen as Tony's son by the Avengers. He could also feel more accepted into the group, like he truly belongs. There could be heart - warming moments where the Avengers share stories about Tony with Peter, helping him to understand his father better and grow into his own as a hero.
Another aspect could be the emotional turmoil for the other Avengers. They would surely be scrambling to find Tony. Captain America might feel especially guilty, considering their past differences. The team would have to put aside their differences completely to rescue Tony. They might start by gathering intel on Thanos' whereabouts and formulating a plan that involves their unique skills. For example, Black Widow could use her espionage skills to infiltrate Thanos' base, while Thor could provide the brute force needed in a direct confrontation.
Well, if Tony wasn't there to assist, the balance of power would have shifted greatly in Thanos' favor. It's likely that the heroes would have faced more losses and the fate of the universe would have hung in the balance in a much more uncertain way.
Yes, Tony did die in the comics related to Endgame. It was a significant plot point that had a big impact on the story.
One possibility is that Tony is extremely good at keeping his identity a secret. He might have used advanced technology to disguise his Iron Man activities so that the Avengers don't notice any connection. For example, he could have created hidden bases and used undetectable communication channels. Also, Tony may act so differently as Iron Man compared to his normal self around the Avengers that they just don't suspect it's him. He might be more confident and bold as Iron Man, while being more laid - back and sarcastic as Tony Stark among the team.
Avengers: Endgame has elements that can be traced back to the comics. However, there are also significant differences and adaptations made for the movie version.
He could form a more relaxed friendship with Thor. Without the burden of loss, Tony could engage with Thor on a more fun level, like they could have more friendly competitions about technology vs magic. He might also build a closer bond with Natasha. Normally, his losses make him a bit standoffish at times, but here he could be more open to her friendship, perhaps sharing his ideas more freely without the fear of being judged based on his past traumas.