The key characters include Selene, who is a central figure as she is a strong and determined vampire. Then there are the vampire elders, who hold great power and influence within the vampire community. There are also some lycan leaders who are important as they are the main antagonists in the war against the vampires. Additionally, there are a few other vampires who are Selene's allies, and they all have different abilities and personalities that contribute to the story.
Selene is a key character. She is a powerful vampire. Also, there are other important vampire lords who play significant roles in the power struggles.
Selene is always an interesting character to focus on. Her strength and determination as a vampire make her a great protagonist. You can explore more of her past and her internal struggles during the blood wars. Another is David, with his complex relationship with Selene and his own ideas about the future of the vampire race.
A vampire scientist. This character could be researching ways to create a new type of vampire that is immune to the weaknesses of traditional vampires, like sunlight or silver. Their experiments could cause a stir among both the vampire and lycan communities.
The main plot involves intense vampire - lycan wars. There are power struggles among different vampire clans. Selene, the main character, is caught in the middle of these battles as she tries to protect her kind and uncover secrets that could change the balance of power forever.
The exiled character is obviously a key one. Their actions and decisions drive the story forward. There may also be a mentor - like figure who helps the exiled character in their journey, either physically or through memories or visions.
The theme of identity is also key. In Divergent, characters are defined by their faction, and they struggle with their identity outside of that. In Underworld, vampires and lycans have their own identities and hierarchies. A fanfiction could explore how a character from Divergent who enters the Underworld has to re - evaluate their identity when faced with the different species and power dynamics. Maybe they start to see themselves not just as a member of a faction but as a powerful being in a new world.
One idea could be to explore the backstories of some of the minor characters in more depth. For example, a side character who has always been in the shadows could have a secret past that ties into the main conflict in a unique way.
One idea could be to explore the backstory of a minor character from the movie. For example, a young vampire who was turned during the wars but has unique powers. Another could be a love story between a vampire and a lycan that defies the age - old feud in the Underworld Blood Wars universe. Maybe they team up to stop a greater evil that neither side was aware of.
Anakin Skywalker, Obi - Wan Kenobi, and Palpatine are key characters.
Elizabeth Holmes is a key character in 'bad blood true story'. She was the founder of Theranos.
As I'm not familiar with this specific novel, it's hard to determine the main characters. But in a story about a blood god, there could be a character who has a special connection to the god, perhaps a chosen one. There may also be a wise old mentor - type character who tries to guide others away from the blood god's influence. And of course, there could be a villainous figure who is a devout follower of the blood god and enforces its will.