There could be a fanfiction where Vampire Stephen Strange has to deal with the thirst for blood while still maintaining his duties as a protector of the world. This internal struggle could add a lot of depth to his character. He may try to find a magical solution to control his vampiric urges without sacrificing his power.
In some Vampire Stephen Strange fanfiction, he could form an unlikely alliance with other supernatural beings. For example, teaming up with werewolves or witches. This alliance would be a result of a common threat that only their combined powers can defeat. He might have to overcome their initial distrust of him due to his vampiric nature.
One interesting Vampire Stephen Strange fanfiction could be about him using his vampire powers to fight off dark magic threats in a different dimension. He might have enhanced speed and strength which he combines with his sorcerer skills.
One interesting story could be where Harry Potter, with his magic from the wizarding world, teams up with Stephen Strange in the multiverse. Maybe they combine their powers to fight a common magical threat that spans across different dimensions. For example, a dark entity that is causing chaos in both the Marvel universe and the wizarding world.
One interesting Stephen Strange fanfic could be those that explore his early days of learning magic at Kamar - Taj. They might show his struggles with the complex spells and his interactions with the other sorcerers. For example, a fanfic could focus on his friendship with Wong and how they overcame challenges together in the mystic arts.
I'm not sure about who the 'best' are specifically, but you can often find good ones by looking at the top - rated stories on fanfiction websites. Some authors might be really good at exploring the darker aspects of a vampire Stephen Strange, like his moral conflicts.
One interesting plot could be Peter Parker getting lost in a strange dimension and Stephen Strange has to use his magic to find and rescue him. This would involve a lot of cool magical battles and Peter using his spider - skills in an otherworldly setting.
One interesting story could be about Jeremy exploring his new vampire powers in a way that the show didn't fully explore. For example, he might use his vampire abilities to protect the town from a new threat that's not related to the typical vampires or werewolves. Maybe he teams up with some unexpected characters to fight this new danger.
I really like 'Strange Encounters'. It delves into an alternate universe where Stephen Strange has to face a different set of challenges. The author does an amazing job of creating a new and exciting world for Strange to navigate, and the way they write his character is very true to the original while also adding new dimensions.
A Vampire Tsukune fanfiction might also focus on his struggle to control his vampiric instincts. He could be in a situation where he has to protect his human friends from other vampires while also dealing with his own inner desires. This internal conflict could make for a very engaging story.
One interesting Vampire Si Fanfiction could be about a vampire who tries to live a normal human life in modern society while hiding his true nature. For example, he might attend high school and struggle with fitting in without revealing his thirst for blood.
One interesting Simon vampire fanfiction could be about his origin as a vampire. It might explore how he was turned and his initial struggles with his new identity. Maybe he was turned by a powerful ancient vampire against his will, and he has to learn to control his bloodlust while still maintaining his human relationships.
One interesting Vampire Waluigi fanfiction could be about his origin as a vampire. Maybe he was cursed by an ancient evil in the Mushroom Kingdom. Another could be his adventures while trying to hide his vampire nature from his friends like Luigi and Mario.