There could also be other characters like the king's advisors or enemies. The advisors might be trying to help the keeper protect the heart, while the enemies would be constantly plotting to get their hands on it. These supporting characters can add depth and variety to the story, creating different plot arcs and conflicts.
Obviously, the keeper is one of the main characters. They are likely to have some special abilities or qualities that make them suitable for the task of protecting the vampire king's heart.
Well, perhaps there's a love triangle in the 'Keeper of the Vampire King's Heart Fanfiction'. The keeper might fall in love with the vampire king, but there could be another character, perhaps a human or another supernatural being, who also has feelings for either the keeper or the king. This can create a lot of emotional turmoil and interesting relationship dynamics.
Well, obviously Beast Boy as the Vampire King is a main character. Often his friends from the Teen Titans like Robin, Starfire, Cyborg, and Raven also play important roles. They might be trying to help him deal with his new vampire identity or be in conflict with him if his vampiric nature starts to cause problems.
The main characters are the vampire king and his bride. The vampire king might be a centuries - old being with a dark past. His actions and decisions are likely to be influenced by his long existence. The bride, on the other hand, could be an ordinary human or from some other race that is not as powerful as vampires. Their interactions are what drive the story forward.
One of the main characters might be Alice. Her ability to see the future could be crucial in helping Edward navigate the political and dangerous situations in his role as king. Also, Jasper could be there. His experience in combat and control of emotions could be useful for Edward's rule. And then there's Rosalie, who might have her own opinions on how Edward should run the kingdom and could be a source of conflict or support depending on the story.
There are also often human characters who interact with the Vampire King. Take Lucy from certain stories. She is a young, curious woman who gets caught up in the Vampire King's world. She may start off as a victim but then could become something more, like a love interest or a pawn in his power games. Her reactions to the Vampire King's presence and his actions drive a lot of the story's plot.
The main character is likely to be the Keeper of Balance themselves. However, we might also see some of the original 'Harry Potter' characters making appearances, like Harry, Hermione, or Ron. They could be there to support or oppose the Keeper of Balance in their quest to maintain the magical balance.
I don't know for sure as I haven't read it. But likely, the alpha king himself is a main character. There might also be a female lead, perhaps a love interest for the king. And there could be advisors or enemies of the king that play important roles.
Obviously, Marshall Lee himself is the central character. He's the vampire king, so he drives the plot most of the time. Then there are often characters like Fionna, who might have a romantic or a friendship - related storyline with Marshall Lee. Prince Gumball can also be a main character in some fanfictions, usually as a sort of foil to Marshall Lee's dark nature.
The Vampire King himself is obviously a very popular character. He is often depicted as powerful, mysterious, and alluring.
In most Edward Vampire King fanfictions, Edward is the central figure. However, new characters can be introduced. For example, there could be a powerful vampire named Victor who is a rival to Edward for the throne. And then there's always the possibility of a human character who gets caught up in the vampire world, like a journalist named Lucy. She might be trying to expose the vampire king or end up falling in love with him. Additionally, Edward's vampire siblings play important roles, such as Emmett who can be his bodyguard or Jasper who helps with diplomatic relations.