One plotline could be Buffy being sent back in time to the Korean War and having to fight both the normal human enemies of the war and some supernatural threat that has emerged because of the chaos of the war. Another could be that a vampire or demon from the Buffyverse somehow gets involved in the war on the side of one of the combatants.
There are various possibilities. For example, a spell gone wrong in Sunnydale could send Buffy and her friends to the middle of the Korean War. They then have to find a way back while also dealing with the immediate threats around them, like enemy soldiers and any lurking supernatural creatures. Maybe there's a powerful artifact from the Buffyverse that ends up in Korea during the war and both sides are unknowingly fighting over it, and Buffy has to retrieve it to prevent some cataclysmic event.
Well, perhaps there could be a plot where a group of slayers, including Buffy, are called to Korea during the war because there are reports of strange disappearances that are actually caused by a demon preying on soldiers. Or it could be that a character from the Korean War era discovers Buffy's world and tries to enlist her help to deal with a local supernatural menace.
One possible plotline could be that the kiss is a moment of unexpected passion. Maybe they've been friends or rivals for a long time, and the kiss changes everything. Another could be that it's part of a magical spell gone wrong, where they have to deal with the consequences of this unplanned kiss. It could also be a plotline where the kiss is a secret moment that they both try to hide from others at first.
Yes, there are some. You can start by looking on fanfiction websites like Archive of Our Own. Some writers might combine the historical context of the Korean War with the Buffyverse in really interesting ways, like having Buffy or other characters be involved in events related to the war in a supernatural capacity.
One possible plotline could be Buffy's friends rallying together to rescue her. They might use their unique skills, like Willow's magic, to track down Angelus and his lair.
There could be a plot where a wolf with special powers is hunted by other packs during the war because they fear his power. Or perhaps a story about a female wolf leading her pack to victory against all odds in a male - dominated wolf - war society. This would involve her facing discrimination at first but then proving herself through her strategic skills and courage. The fanfiction could also explore how the war changes the landscape and the hunting grounds of the wolves, and how they have to adapt to these changes in their plotlines.
One possible plotline could be that the 'darhkness' is a new super - villain or an ancient evil that has been awakened. The Arrow team has to find a way to defeat it using their skills and newfound powers or technology.
One possible plotline could be that Harry discovers his connection to Buffy and has to navigate the world of slaying while also dealing with his own magical world in Harry Potter. Maybe he uses his magic to help Buffy in her battles against vampires and demons in a way that no one else can.
One possible plotline could be about the rebuilding efforts after the war. Characters might struggle to restore their communities, deal with the emotional trauma of the war, and reconcile with former enemies. For example, a soldier who once fought against a group could now be working side by side with them to rebuild a city that was destroyed during the conflict.
One possible plotline could be about the rebuilding of the society. After the war, the factions might need to be re - established or perhaps a new system entirely is created to prevent future wars. Characters could be dealing with the trauma of the war while also trying to find their place in this new world.
One possible plotline could be a world under totalitarian rule. Voldemort would likely impose strict pure - blood supremacy laws. Muggle - borns would be persecuted and forced into hiding or slavery. Hogwarts might be turned into a place that only teaches the Dark Arts and Voldemort's ideology. Another plotline could involve the resistance. Some brave witches and wizards might form an underground movement to fight against Voldemort's regime, with their own struggles and sacrifices.
Perhaps in the fanfiction, Ginny becomes a professional Quidditch player after the war, while Harry focuses on training new Aurors. Their relationship could be strained by their busy schedules, but they eventually find a balance. They also might have to deal with the remaining Death Eaters who are still causing trouble.