Well, it could change Tony Stark's character a great deal. He wouldn't have the same emotional baggage of losing his parents at a young age. Maybe he'd be less reckless and more family - oriented.
Howard and Maria's survival would have a huge impact on the story. Politically, Howard could use his influence and wealth in different ways. He might be able to sway public opinion about the Avengers more effectively. In terms of technology, he could introduce new inventions that would change the way the Avengers fight their enemies. And on a personal level, for characters like Tony, it would mean a completely different life. He could grow up with his parents' guidance, which would shape him into a different kind of hero. Their presence would also add more family - centric themes to the story, which could be explored in various ways, such as family secrets and legacies.
Yes, in some Avengers fanfictions, authors like to create alternate universes or timelines where Howard and Maria are still alive. This can lead to very interesting plot developments, such as Howard contributing his scientific genius in new ways and Maria being involved in the Avengers' world more directly.
In many Avengers fanfictions, their fate varies. Some writers keep them alive to explore new plotlines, while others might use their supposed deaths to drive the story in a different direction.
It could be a plot device to create drama or tension within the story. Maybe Howard was distracted or had some sort of confusion that led to the mistake.
Maybe Howard was under a lot of stress or had some sort of memory lapse that led to this mistake. Or it could be part of a magical or alternate reality scenario.
It could involve some kind of advanced technology or a magical device that enables their time travel. Maybe it's a secret experiment gone wrong or a mysterious relic they stumble upon.
In fanfiction, Howard could show more patience and understanding towards his children. Maybe spend quality time with them and support their dreams without being too controlling.
Howard Stark could time travel in Avengers fanfiction by stumbling upon an ancient artifact with time-bending powers. Or maybe he's part of a secret experiment gone right (or wrong!), sending him hurtling through time. It depends on how creative the writer wants to be!
In many such fanfictions, Howard might be shown as verbally or emotionally abusing Tony, constantly criticizing and belittling him.
One possibility is that the Avengers are facing a threat related to some old Hydra experiments that Howard Stark was once involved in. They meet him to gather information about the experiments, like the location of hidden files or the identities of key Hydra operatives from that time. Howard Stark, being the brilliant mind he is, joins forces with the Avengers to stop Hydra's resurgence.
In some fanfictions, time travel for Howard and Maria Stark might be enabled by advanced Stark tech like a time - traveling device. Maybe it's a wrist - worn gadget or a large - scale machine. This tech could manipulate the space - time continuum, allowing them to jump to different eras.