One possible plotline could be Archer and Kiritsugu teaming up to face a powerful common enemy. They might combine their different skills and strategies to overcome challenges.
Perhaps there's a plot where Archer has to learn from Kiritsugu's more ruthless methods. Kiritsugu's no - nonsense approach could make Archer reevaluate his own actions. This could lead to some interesting character development for Archer as he grapples with new ways of thinking.
Another plot could involve a time - travel aspect. Maybe Archer gets sent back in time to meet a younger Kiritsugu. They could then interact in a way that changes the future or has unexpected consequences. For example, Archer might accidentally influence Kiritsugu's decisions in a way that alters the course of events he knows from his own timeline.
Archer is often well - written in these fanfictions. His complex personality and his own set of values can create a lot of interesting interactions, especially when paired with Kiritsugu.
In another scenario, the fanfiction could be set in a post - apocalyptic world. Shirou and the female archer are part of different survivor groups. They meet during a scouting mission. At first, there is tension between them due to the rivalry between their groups. However, as they realize that they share a common love for archery and a desire to rebuild the world, they decide to work together to bring peace and restore the art of archery in the new world.
One possible plotline could be Yelena initially being distrustful of the Avengers. Maybe she has been taught to view them as enemies, but as she gets to know them, she realizes they have similar goals. For example, she might find common ground with Natasha's former teammates in their fight against evil.
One interesting plotline could be Luigi and Daisy teaming up to solve a mystery in the Mushroom Kingdom. Maybe there's a strange disappearance of power - ups, and they use their unique skills to figure it out.
One interesting plotline could be Harry somehow traveling back in time to meet Grindelwald in his prime. This could lead to a battle of wits between them, with Harry trying to stop Grindelwald from starting some of his more heinous plans early. Another might be that Grindelwald, seeing Harry's power, tries to recruit him to his side, offering him power and knowledge that Harry has to resist.
One possible plotline could be that Caroline and Hope initially have a misunderstanding when they meet. Maybe Caroline misinterprets Hope's intentions, leading to some tension at first. Then as the story progresses, they discover they have common goals, like protecting their families or the supernatural community they belong to.
One interesting plotline could be their initial meeting being filled with suspicion but gradually turning into mutual respect as they realize they both have a common goal of saving the realm. For example, Jon might be initially wary of Daenerys and her dragons, but as they talk more, they find they can work together against the White Walkers.
In some 'itachi meets sarada fanfiction', Itachi could be brought back to life temporarily. He and Sarada might go on a journey together to face a new threat to the village. During this journey, Itachi could act as a mentor to Sarada, teaching her how to handle difficult situations and how to use her Sharingan more effectively.
Another plotline could involve Petunia getting involved in one of the Marauders' adventures by accident. Maybe she stumbles upon them while they are exploring a secret part of Hogwarts and has to work with them to get out of a tricky situation.
One interesting plotline could be Stiles initially being intimidated by the pack but then gradually forming deep friendships. For example, he might start off being scared of their supernatural powers but as he gets to know them better, he realizes they are just like him in many ways, with their own insecurities and desires.