In some fanfictions, Tony might be consumed by guilt. He could blame himself for not being able to protect Peter. After all, he saw Peter as a sort of protege. He might withdraw from the world, shutting out his friends and allies. His work on new inventions might halt as he is constantly haunted by Peter's death.
Tony could also become vengeful. He would seek out those responsible for Peter's death with a single - minded determination. He would use all his resources, both technological and financial, to make them pay. His anger would fuel his actions, and he would not rest until justice was served in his eyes.
Another reaction could be extreme sadness and depression. He might isolate himself in his lab, surrounded by Peter's mementos. Tony could stop taking care of himself, losing his appetite and not sleeping well. His usual witty and confident self would be replaced by a broken man, who lost someone he deeply cared about.
He could be filled with grief. Yondu had a special bond with Peter, so his death might make Yondu feel like he failed to protect him.
Maybe Peter inherits Tony's high - tech gadgets. For example, he could get access to some of Tony's Iron Man tech, which would be a huge deal. This could set him on a new path in his superhero journey, perhaps allowing him to upgrade his own suit or develop new abilities.
Ino would be devastated. Since she and Sakura had a complex relationship that evolved from rivalry to friendship, Ino would likely blame herself. She might think that if she had been stronger or closer to Sakura, she could have prevented her death. Ino could also be angry at the situation or the enemies that led to Sakura's death and use that anger to become more powerful in her own ninja abilities.
In some fanfictions, he could die as a result of a long - term undercover mission gone wrong. He gets too deep into the criminal underworld and is ultimately betrayed by someone he thought he could trust. His death shocks everyone, and the team has to deal with the guilt of not being able to protect him while also trying to take down the people responsible.
Perhaps in a post - apocalyptic fanfiction setting, resources are scarce and Peter finds Tony's clothes. Wearing them gives him a sense of hope and protection. It could be that the clothes have some built - in defenses that Peter discovers while wearing them. Or maybe Peter is trying to inspire a new generation of heroes by wearing Tony's iconic clothes. He could tell stories about Tony to the younger ones while wearing them, passing on Tony's legacy in a very tangible way.
One possible reaction could be Tony's heartbreak. He might feel betrayed and angry, leading to a rift in his relationship with Steve. He could also become distrustful of others in the future.
One possible storyline could be Tony helping Peter deal with school bullies. Since Tony is now his guardian, he uses his influence and resources to ensure Peter has a safe and positive school environment. For example, he might set up a scholarship fund in Peter's school for anti - bullying programs.
Maybe in the fanfiction, Tony discovers Peter's potential not just as Spider - Man but also in other areas like science. So he starts mentoring Peter more intensively, leading to a closer father - son type of relationship. They could work on new inventions together, with Peter learning a great deal from Tony's experience.
One consequence could be that the Avengers are left in disarray. Tony was a key figure in terms of resources and technology. His death might mean a lack of funding and advanced equipment for the team.
In some fanfictions, Tony's grief could lead to a spiritual or philosophical transformation. He might start to question the very nature of heroism and the sacrifices it entails. He could become more involved in the moral and ethical debates within the superhero community, using Peter's death as a catalyst for change.