An ancient vampire from a different clan. This character could have different values and powers compared to Kanme. They could come to Kanme's world either as an ally or an enemy, depending on their motives. Their presence could stir up the power balance in the Vampire Knight world and force Kanme to make some tough decisions.
A witch character could be great. They could have powers that either complement or oppose Kanme's vampire abilities. Maybe a young, curious witch who is intrigued by Kanme and wants to study his unique vampire nature.
A human hunter who has a change of heart after meeting Kanme. This character could start off as someone who is dedicated to hunting vampires but then realizes that not all vampires are bad, especially after getting to know Kanme. They could bring a new perspective to the story and also create some interesting conflicts.
Well, a plot could revolve around Kanme's struggle with his vampire nature in a different way. For example, he discovers a new power within him that he doesn't understand and has to learn to control it while also dealing with the politics and power struggles in the vampire world. Also, a story where Kanme forms an unlikely alliance with a group of humans who are trying to understand vampires better could be really engaging.
It could be a vampire hunter's daughter. She might be sent to the school undercover to gather information on the vampires there.
A tech - savvy teen who idolizes Sam and Bucky. This character could help them with advanced technology during their missions, like hacking into enemy systems or creating new gadgets. They could also provide a fresh perspective and some light - hearted moments in the story.
A young Twi'lek Force - sensitive. Twi'leks are known for their grace and beauty, and this character could bring a new perspective. Maybe they have a unique way of using the Force that Ahsoka has never seen before. Another could be a droid with a malfunctioning memory core that holds secrets about the Jedi Order from a long - forgotten era.
Obviously, Hinata herself is a very interesting character in these fanfictions. Her character from her original source material brings a certain innocence and determination that gets explored in new ways in the Vampire Knight setting. Then there are the vampire characters like Kaname Kuran. His complex personality and his relationship with Hinata can be really captivating in fanfiction. Another interesting character could be Zero Kiryu, especially when his story intersects with Hinata's, given his own struggles with his vampire side.
One new character could be an old gardener who has a special connection with plants. He could have a lot of wisdom about strange plants like Audrey II and offer Seymour some advice on how to handle it. Also, a young apprentice florist who looks up to Seymour. This character could get caught up in the chaos with Audrey II and have to learn some tough lessons about the dark side of plants.
She might possess the power of time manipulation. This power would be extremely rare and dangerous. She could use it to change the course of events, whether it's to prevent a vampire attack or to save a character's life. However, using this power might have unforeseen consequences and put her in the middle of a great conflict.
Yuki is also a beloved character in fanfiction. Her unique position between being human - like and having vampire traits can be further explored. In Pureblood fanfiction, she might interact with Purebloods in ways that are different from the original story, such as getting involved in Pureblood politics.
Zero is often very popular. His complex character, being a vampire hunter with vampire blood himself, makes him full of contradictions and depth. Fans are intrigued by his internal struggle between his human side and the vampire instincts within him.
Perhaps a rogue vampire who has his own agenda. He might be jealous of the red knight's power or status and constantly tries to undermine them. This vampire could be very cunning and not afraid to use dirty tricks to get what he wants.