Well, a common story in Halo Wars time travel fanfiction is when a group of UNSC soldiers accidentally travel back to a time before the Covenant attacks. They then use their knowledge of future events to prepare better defenses. Also, there could be a story where a Forerunner time-travels to the Halo Wars era. This could bring in advanced Forerunner technology and knowledge that could either help or disrupt the existing balance of power. Some stories might also involve time loops, where characters keep repeating a certain period in the Halo Wars timeline until they figure out how to break the loop.
One popular storyline could be about a Spartan going back in time to prevent a major disaster in the Halo Wars timeline. For example, they might stop a key Covenant leader from being born, thus changing the course of the war. Another could involve time-traveling to retrieve lost technology from the past to use against the enemy in the present. And some might focus on the ethical dilemmas of time travel, like whether changing the past is really the right thing to do even if it could save lives in the future.
In some Halo Wars fanfiction, there are storylines where the Flood manages to infect both the UNSC and Covenant forces simultaneously. This forces an unlikely alliance between the two sides as they try to fight off the common enemy. It's a unique take on the Halo universe that shows how desperate the situation can get.
There could be fanfictions that explore the relationships between the various characters in 'Halo Wars'. Maybe a story about the friendship or rivalry between two Spartan leaders. They can add more depth to the existing characters by creating new scenarios for them to interact in.
Well, a cool storyline could involve the Flood from Halo and the Tyranids from Warhammer. Imagine if the Flood somehow made its way into the Warhammer universe. The different races in Warhammer would have to deal with this new, insidious threat that spreads like wildfire. And on the flip side, the psykers in Warhammer could potentially have some interesting interactions with the Halo universe's Covenant, who have their own sort of 'psionic' abilities with the Prophets and such.
The Halo Wars novels have storylines that are deeply intertwined with the lore of the Halo franchise. There are storylines centered around the relationships between different species. For instance, the complex relationship between humans and the Elites is explored. Some storylines also deal with the internal politics within the UNSC and the Covenant. This includes power struggles, betrayals, and the search for a way to end the long - standing war. Additionally, the discovery of ancient Forerunner artifacts and how they impact the ongoing war is a significant part of the storylines.
One interesting storyline could involve the Straw Hats traveling through time and meeting their younger selves. This would create some really cool character - development moments. For instance, Luffy could meet his younger self and give him some advice on how to become a great pirate. Or, they could time - travel to a period when a powerful devil fruit was first discovered. This would lead them on a quest to either obtain it or prevent it from falling into the wrong hands. Additionally, they might time - travel to an era where different races had more significant roles in the world, and they'd have to deal with the cultural differences and power dynamics of that time.
One popular storyline could be Bran going back in time to prevent the death of his father, Ned Stark. This would completely change the course of the story as Ned played a crucial role in the political drama of Westeros. Another could be Bran traveling back to the time of the First Men and learning ancient magic that he then uses to fight the White Walkers in his own time.
One popular storyline is Anakin's relationship with his Padawan, Ahsoka Tano. Fanfictions often explore their adventures during the Clone Wars, like facing a new and powerful Sith threat together. Another is Anakin's inner struggle with the dark side. Writers might depict his temptations and how he tries to resist them in different situations. Some fanfictions also focus on Anakin's friendships with other Jedi, like Obi - Wan Kenobi, and how they support or conflict with each other during the chaotic times of the Clone Wars.
In Star Wars Rebels, a popular storyline is the crew of the Ghost fighting against the Empire. In fanfiction, there are many where a new character joins the Rebellion. For example, some fics focus on a young Force - sensitive individual finding their place among the rebels.
In certain fanfictions, the use of Rinnegan - powered time travel could lead to the discovery of hidden secrets in the Naruto world. As for the harem, the main character might find himself in situations where he has to protect multiple female characters during his time - traveling adventures. This protection and shared experiences could then lead to the formation of the harem. For instance, he travels to a time when the Akatsuki is more active and saves some female ninjas from their attacks, and they fall for him.
Another storyline could involve Natasha exploring her past in more depth during the time travel. She could interact with her younger self, giving advice or just sharing experiences. This could lead to a whole new level of character development for her. For instance, she might help her younger self become a better spy earlier on, which would then have a butterfly effect on the future events in the MCU timeline.