A plot could be Wendell trying to break a curse that was placed on him by an evil witch. The curse might be slowly turning him into a more monstrous version of a vampire, and he has to find a way to reverse it before it's too late. He could travel to far - off lands in search of a cure, meeting all sorts of strange creatures along the way.
One possible fanfiction could be about Wendell's journey to find his place in the human world. He might struggle with his vampire nature while falling in love with a human. This would create a lot of internal conflict as he has to decide between his vampire heritage and his new - found human emotions.
One idea could be that the vampire prince has to hide his true identity in the human world while falling in love with a human. This would create a lot of tension as he tries to protect his secret and his new love.
One interesting plot idea could be Sora being turned into a vampire while in a new, dark world in the Kingdom Hearts universe. He might struggle with his newfound vampiric urges while still trying to fulfill his duty to protect his friends and the worlds. Another could be a story where Sora has to face off against an ancient vampire lord who is threatening the balance of the worlds. He could use his unique Keyblade skills in combination with his new vampire abilities.
A great one could be a story about a vampire hunter who arrives in the Tenth Kingdom. At first, he thinks all vampires are bad, but as he delves deeper, he realizes that some vampires are actually victims of a greater evil. He teams up with a local vampire to fight this evil, which turns out to be an ancient sorcerer who wants to use the vampires' powers for his own dark purposes. This story would have lots of action and moral dilemmas.
One idea could be exploring the backstories of the new characters introduced in Kingdom Hearts 3 in more depth. For example, you could write about how they came to be in the different worlds and what their true motives are.
One idea could be exploring the backstories of the minor characters in the 10th kingdom. Maybe a story about the life of a random villager and how the events of the main story affected them.
A great plot could be about a female character from 'last kingdom fanfiction' who disguises herself as a man to join the army. She then has to constantly hide her identity while also dealing with the challenges of war and her growing feelings for one of her comrades.
One idea could be a crossover adventure where Aqua and Erza team up to face a powerful dark force. Maybe they start off as rivals, with Aqua's Keyblade skills and Erza's swordsmanship clashing in a misunderstanding. But as they realize they share a common enemy, they combine their powers. Aqua could use her magic to support Erza's more direct combat approach.
One idea could be that Merlin, as a wizard, is hunted by vampires because his magic is seen as a threat to their existence. But then he discovers that some vampires are not as evil as he thought and they form an uneasy alliance to fight a common enemy, like a dark sorcerer.
Well, you could have a story where a small town is suddenly surrounded by vampires. The townspeople have to quickly learn how to defend themselves. Maybe they start using old - fashioned weapons like stakes and crossbows. And there could be a mystery within the town, like someone is secretly working with the vampires. This adds an element of suspense to the survival aspect.