One idea could be that Neanderthals developed advanced agriculture before modern humans. This would change the power dynamics and the way the land was used. They could have built large settlements and had a complex social hierarchy based on the control of food resources.
A Neanderthal shaman could be a main character. They were likely the spiritual leaders of their tribes. This shaman could have the ability to communicate with the spirits of the animals they hunted or the forces of nature. His or her journey to gain more spiritual power and knowledge could be an interesting plot.
One interesting concept could be a world where the Axis powers won the war. This would lead to a completely different geopolitical landscape, with different countries under different forms of rule. Another could be if certain key battles had different outcomes, like if D - Day had failed. It would have a huge impact on the course of the war and the future of Europe.
Some interesting plots in RWBY alternate fanfiction could involve an alternate reality where the Dust doesn't exist. This would completely change the way combat and technology work in Remnant. Hunters and Huntresses would have to rely more on their physical abilities and semblances. Or there could be a story where Team RWBY is formed much earlier in their lives, like as children, and they grow up together facing different challenges than in the original story. There could also be a fanfic where the world of Remnant is invaded by an outside force from another dimension, and the RWBY characters have to adapt quickly to this new threat.
Another plot could be a different take on the fall of Anakin Skywalker. Instead of Palpatine's manipulation being the sole factor, there could be an ancient Sith artifact that influenced him. This would add a new layer of mystery and a different origin for his turn to the dark side.
Well, alternate history fiction basically takes real historical events and changes one or more key elements to create a new fictional narrative. It allows us to think about all the possible 'what ifs' in history.
One interesting scenario could be if Hitler had been assassinated early in the war. This might have led to a power struggle within the Nazi regime and potentially a quicker end to the war in Europe. Without Hitler's fanatical leadership, the military strategies might have changed drastically.
In certain alternate history civil war fictions, a plotline might involve a different political ideology taking hold in one of the regions. For example, if the South had embraced a more socialist - like ideology, the war would not be just about slavery but also about different economic systems. The battles and strategies would be shaped by this new ideological divide. Or, what if a female general emerged in either the North or the South? Her leadership style and decisions would be a unique aspect of the story, challenging the traditional gender roles of the time and influencing the course of the war.
One interesting plot could be that Naruto is born into a different clan, like the Uchiha. This would completely change his story arc as he'd have to deal with the Sharingan and the Uchiha's dark past. Another idea is if all the characters' genders were swapped. It would bring a fresh perspective on their relationships and how they interact in the ninja world.
One idea could be an alternate universe where the ponies have different elemental powers. For example, instead of Twilight Sparkle being a unicorn with magic related to friendship, she could control time. This would change the entire dynamic of the stories and the relationships between the ponies.
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.