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.
Donald and Goofy could still be his allies. Despite Sora being a vampire, they might see that he's still the same Sora at heart. Riku could also be an ally, as he has always been there for Sora in different situations. Maybe even some of the Disney characters, like Mickey Mouse, who is known for his kindness and understanding, would be willing to help Sora control his vampiric side and fight against any threats that come with it.
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.
Sure, there are some 'Kingdom Hearts Rosario Vampire' fanfictions. However, it can be a bit of a niche combination, so the number of available fictions might not be as large as more popular crossovers. You could also try reaching out to fans of both series on relevant forums and ask for recommendations. They might be able to point you towards some hidden gems that you wouldn't find easily through a simple search.
One interesting 'Kingdom Hearts Vampire' fanfiction could be about a character from Kingdom Hearts being turned into a vampire and having to deal with new powers and a thirst for blood while still trying to fulfill their original quest. For example, Sora as a vampire might struggle to control his new urges while still fighting against the Heartless.
One common theme is the exploration of different worlds. Since Kingdom Hearts has the concept of traveling between various Disney - inspired worlds, in fanfictions, authors might incorporate the Rosario Vampire setting into those travels. Another theme could be the power dynamics between characters. In Rosario Vampire, there are different types of supernatural beings with their own powers, and in Kingdom Hearts, the characters also have unique abilities, so seeing how they interact in terms of power is interesting.
First, you need to be familiar with the Kingdom Hearts universe. Know the characters, their personalities, and the overall lore. Then, think about how vampires would fit into this world. Decide if you want to create new vampire characters or turn existing ones into vampires. For example, you could start with a basic plot like a vampire outbreak in a Kingdom Hearts world. Sketch out the main events and how the characters will react to this new threat.
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 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.
There was a long-term grudge and war between the Yiqu Kingdom and the Qin Kingdom. The Yiqu Kingdom was established at the end of the Western Zhou Dynasty. By continuously attacking the surrounding Xirong tribes, they built dozens of cities and sent soldiers to guard them. During the period of Duke Mu of Qin, Qin used the strategy of the Rong people to attack the Yiqu Country. They took down twelve cities in Yiqu and expanded their land by thousands of miles. However, the Yiqu Kingdom was not completely destroyed. It still existed and made peace with the Qin Kingdom. Later on, the Qin State adopted a policy of appeasement, roping in, and corruption. They had an affair with the King of Yiqu to limit the power of the Yiqu State. In 331 B.C., civil strife broke out in the Yiqu Kingdom. The Qin Kingdom took the opportunity to send troops to attack, and the Yiqu Rong surrendered to the Qin Kingdom. However, even if they surrendered on the surface, the king of Yiqu still caused trouble for Qin in the chaotic battle of the Central Plains. In 318 B.C., the Yiqu Kingdom betrayed the Qin Kingdom and paid tribute to the Wei Kingdom, which dealt a serious blow to the Qin Kingdom's plan to advance eastward. At this critical moment, Qin country adopted an ingenious method. In general, the relationship between the Yiqu Kingdom and the Qin Kingdom was one of love and hate. The Qin Kingdom had adopted many strategies to limit the power of the Yiqu Kingdom.