First, decide on the point of divergence from the original timeline. It could be a decision made by a character, a historical event, or something else. From there, map out how that change would impact subsequent events and shape the story in a new way. Consider how characters' motivations and goals might shift as a result.
Well, first, you need a clear idea of what event or decision will cause the alternate history. From there, think about how that one change would lead to different developments in different areas. Maybe technology progresses differently or major wars have different outcomes. Also, consider how people's lives and values might shift.
Well, in the alternate timeline novels, the events are significantly different from the original. For instance, character developments might be completely new. In the original timeline, a character may have had a certain arc, but in the alternate, it could be something else entirely.
The 'Star Trek: Beyond' novel might also be considered. It expands on the events of the movie set in the alternate timeline. It includes additional character backstories and some extra plot elements that couldn't be fully explored in the movie. For example, it delves deeper into the relationships between the crew members in this new timeline.
One popular one is 'The Man in the High Castle' by Philip K. Dick. It presents an alternate timeline where the Axis powers won World War II. Another is 'Jonathan Strange & Mr Norrell' which is set in an alternate 19th - century England with a different take on magic and history. And 'Fatherland' by Robert Harris imagines a world where Hitler won the war.
Itachi is a very popular character in these fanfictions. In alternate timelines, fans explore what could have happened if he hadn't carried out the Uchiha massacre. Maybe he could have been a positive force in the Uchiha clan's growth and in the overall ninja world. Another popular character is Jiraiya. In different timelines, his influence on Naruto could be altered, or he could have different adventures that change the course of the ninja world.
One interesting concept could be a timeline where Naruto fails to bring Sasuke back. This would lead to a very different Konoha, with Naruto perhaps being more jaded and Sasuke's actions having far - reaching consequences for the ninja world. Another concept might be a timeline where the Akatsuki actually succeeds in their goals, which would completely reshape the power dynamics and politics of the ninja world.
In an alternate timeline, Steve Rogers and Tony Stark might be closer friends from the start. Maybe they met during a different event and bonded over a shared love for some old - fashioned values. Their relationship could be less strained, which would also affect how the Avengers as a whole operate. Without their initial bickering, the team could be more united earlier on.
One interesting plot idea could be that in the alternate timeline, Tony Stark never becomes Iron Man. Instead, he devotes his life to clean energy research and Pepper Potts takes on a more superhero - like role, using Stark tech to fight crime. Another idea is that the Avengers lose the Battle of New York in this timeline, which leads to a dystopian world where the Chitauri rule, and the remaining heroes have to form an underground resistance.
Hermione Granger remains very popular. In alternate timelines, she can often be portrayed as even more powerful or having different roles. For example, she might be a leader in a wizarding revolution. Harry Potter himself is also a central figure in most of these fanfictions, with his story being tweaked in various ways. And Draco Malfoy is often a popular character as well. His complex personality allows for a lot of interesting character development in alternate timelines, such as him becoming an ally to Harry instead of an enemy.