The plot is crucial. It could be a love story between a human and a vampire, but with some twists. Maybe the vampire has to protect the human from other supernatural threats. Or it could be about a group of vampires trying to fit into human society without being discovered. A good plot keeps the reader engaged from start to finish.
One interesting story could be about a pony who discovers they have vampire-like powers and has to struggle with how it affects their friendships. For example, they might be afraid of hurting their friends accidentally.
You can try looking on fanfiction websites like Fimfiction. There are a lot of writers who post their works there, and you might be able to find some great my little pony vampire fanfiction among the many stories available.
Goodreads can also be a place to find some. There are groups on Goodreads that discuss and recommend fanfiction. You could join those groups and ask specifically about'my little vampire' fanfiction. Members are usually very helpful and might point you in the right direction.
First, come up with a unique concept. For example, you could make your vampire have a special power that is different from the typical ones. Then, think about the setting. Will it be in a modern city or a fictional, gothic - like place? Next, create interesting characters around your vampire. Don't forget to give them flaws and desires.
Well, of course, there's the little vampire himself. He could have a best friend who is a human, a brave kid who is not afraid of the vampire's nature. There might also be an old vampire mentor who teaches the little one about vampire traditions and how to control his thirst.
One great 'Little Vampire Gregory' fanfiction is 'Gregory's New Adventure'. It takes Gregory into a modern city and shows how he adapts to new technology while still being a vampire. It's really interesting to see how the author blends the traditional vampire traits with modern settings.
One common theme is the struggle between the vampire's nature and the human world. Since they are vampires, they have different needs like drinking blood, but they also want to interact with humans. Another theme is friendship. Often, a little vampire will form a strong bond with a human or another supernatural being. For example, in many fanfictions, the vampire has a human best friend who helps him navigate the human world.