If the Avengers think Tony didn't lose anyone in fanfiction, it could make Tony seem more of an enigma to them. They would expect him to be more jovial and less guarded. This would change how the Avengers approach him. They might be more likely to include him in more light - hearted activities or missions. His decisions would also be perceived differently. For instance, if he decides to fund a project, it wouldn't be seen as a way to prevent future losses like in the original story, but rather just a business or innovation decision. This could lead to a very different kind of Avengers team, where Tony is more of an uncomplicated figure in their eyes.
Well, in some fanfictions, the writers might choose to focus on other aspects of Tony's story rather than his losses. They could be more interested in his technological achievements or his relationships that are not centered around loss. For example, they might explore his friendship with Bruce in a way that doesn't touch on any losses Tony might have experienced.
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.
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.
It could become more tense. If they see different versions of themselves or different outcomes for their relationships, it'll cause stress. For instance, if Vision sees a future where he and Wanda are separated, it'll be tough on their relationship in the present.
In fanfiction, their relationship can be more equal. For example, in some stories, Carmela is not as submissive as in the show. She stands up to Tony more often and he respects her for it. This changes the power dynamic between them.
Well, at first it might make the other Avengers be overly protective of Peter. They would see him as Tony's legacy and might hold him to high standards. For example, Captain America could be stricter with him in training, thinking he should live up to what Tony would expect. This could make Peter feel pressured as he has to constantly prove himself not just as Spider - Man but also as 'Tony's son' in their eyes.
Well, it would change a lot. Naruto's relationship with Kurama would be completely different. Instead of being a sort of power - within - him entity, Kurama would have a more maternal role. Maybe she'd be more protective and nurturing. This could also change Naruto's view of himself, as having a tailed beast as a mother is quite extraordinary.
It could create a rift. Some Avengers might still believe in fighting, while others are firmly against it. For instance, Captain America, who has always been about duty and fighting for what's right, might be at odds with Iron Man, who could be more cynical after seeing the consequences of their actions. This would lead to a lot of internal conflict within the group.
The power balance would shift. With Wonder Woman's strength, speed, and combat abilities, the Avengers would become an even more formidable force. They might be able to take on tougher enemies more easily.
Well, it would completely turn the story upside down. Naruto's relationship with the Nine - tails has always been that of a jinchuriki and the tailed beast within him. If he were the father, it would mean a whole new origin for the Nine - tails. Maybe it would change how Naruto is perceived in the ninja world. Instead of being the one who has to control the Nine - tails' power, he would be seen as its creator or progenitor. This could lead to different power hierarchies and alliances in the story.