It's really hard to say who the most popular OC is as it can vary from reader to reader. Some might like the ones with unique powers like a vampire OC who can control the elements. Maybe it's the character who has a complex backstory that involves a love - hate relationship with one of the main Twilight characters.
Well, in many Twilight fanfictions, an OC that is a vampire often stands out if they have a strong moral code that is different from the typical vampires in the original series. For example, an OC vampire who refuses to drink human blood and instead finds a way to survive on animal blood in a more creative way than the Cullens. This kind of OC can attract a lot of readers because it adds a new dimension to the vampire lore in the Twilight universe.
The concept of the first vampire in this fanfiction might be unique because it could have a different origin story than the traditional vampire lore. Maybe it wasn't created through a bite but through some ancient magic or curse that was specific to the Twilight world.
Aro is frequently a popular character in this type of fanfiction. His power - to read every thought a person has ever had through a single touch - is so unique. Writers often explore more of his backstory and his relationships with other ancient vampires in the Twilight universe. Additionally, some original ancient vampire characters created by fanfiction authors become popular, like the character of 'Elysia' in some stories who is an ancient vampire with the power to manipulate time and she has a complex relationship with the Cullens.
Damon and Bella is also quite popular. Damon's bad - boy charm from The Vampire Diaries and Bella's somewhat introverted but strong - willed nature from Twilight can create a very dynamic relationship in fanfiction. They could have some really intense and passionate encounters.
Edward Cullen is often a popular character in these fanfictions. His complex personality as a vampire makes him an interesting addition to any story involving vampire - hybrids. Fans like to explore how he would interact with a hybrid, given his strong opinions on vampires and humans in the original Twilight series.
One popular original character is a half - vampire, half - human hybrid that has unique powers. This character often has to navigate between the two worlds, and fans love the idea of a character that doesn't fully belong to either side. Another is a vampire hunter who has a change of heart after getting to know a vampire. It adds a new dynamic to the story of vampires and humans co - existing. There's also a powerful witch who gets involved in the vampire - human drama in Twilight fanfiction, bringing in a new element of magic.
Buffy herself is quite popular. Fans like to see how she'd interact with the Twilight characters. Edward also often features prominently as his brooding nature contrasts with Buffy's more action - oriented personality. Another popular character is Spike from Buffy. His edgy vampire persona can create interesting dynamics when paired with the Twilight vampires.
One popular type of original character is the lone newborn vampire who is trying to find their way on their own. They often have a tragic backstory that led to their transformation. Another popular original character is the newborn vampire who has a special power that sets them apart from the normal vampires in the Twilight universe. And there are those original characters who are befriended by the Cullen family and bring a new dynamic to the group.
One popular type of OC is the super - soldier. These characters are often genetically enhanced or have undergone some sort of extreme training. They can hold their own against the Terminators in hand - to - hand combat. Another popular OC is the brilliant scientist. This character might be on the verge of a breakthrough that could turn the tide in the war against Skynet.
One popular type of OC is the powerful female night elf ranger. With her skills in archery and connection to nature, she often stands out in stories. Another is the young human paladin, full of idealism and on a quest to prove himself in the chaotic world of Warcraft.
A popular OC could be a character who has a strong moral code but is also a bit of an outcast. This character tries to bring peace and justice to the Blazblue world in their own way, which often puts them at odds with some of the more chaotic elements in the story. Their journey of self - discovery and their attempts to make the world a better place make them a fan - favorite.