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, 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.
In Endgame, the Avengers try to reverse the Snap. They come up with a time - heist plan to get the Infinity Stones from different points in the past. There are many emotional reunions and sacrifices. In the end, they are able to bring back those who were snapped, and Iron Man sacrifices himself to defeat Thanos once and for all.
Avengers: Endgame's backstory encompasses a lot. It ties together the loose ends from previous installments, showing how the heroes were affected by past battles and how they prepared for the ultimate showdown with Thanos.
Sure is. The movie draws inspiration and elements from the rich world of Marvel Comics, specifically those related to the Avengers and their adventures.
Avengers: Endgame wasn't initially a comic. It was a highly anticipated and spectacular movie that capitalized on the popularity and rich history of the Marvel Comics. While it may have shared similarities and concepts with the comics, it was a standalone cinematic creation that thrilled audiences worldwide.