Not having read the 'bad blood graphic novel', we can only speculate. There could be a young and idealistic character who is shocked to discover the bad blood in their community or family. There might be an older, wiser character who has been living with this bad blood for a long time and has some insights into it. And then there could be a mysterious character whose actions or secrets are at the heart of the bad blood.
In 'batman bad blood graphic novel', there are several key characters. Batman is a central figure even though he goes missing early on. Batwoman is a major character who steps up to fill the void left by Batman. She's strong and resourceful. Robin also plays an important role. He's young but determined to help find Batman and keep Gotham safe. Other members of the Bat - family, like Alfred, are also there to support and provide guidance throughout the story. There are also the villains who are the antagonists and drive much of the action.
Since I haven't had the chance to read 'In the Blood', I can't say who the main characters are. However, in most graphic novels, the main characters are usually the ones driving the plot forward. They could be ordinary people who find themselves in extraordinary situations, or they could be heroes or anti - heroes with unique abilities or characteristics related to the 'in the blood' concept.
There could be a hero - like character who is bound by the blood promise. Maybe there's also an antagonist who tries to stop the protagonist from fulfilling the promise. And perhaps some side characters who help or hinder the main character along the way.
In the 'Books of Blood graphic novel', the main characters are often complex individuals. Some are haunted by their own past actions and are then thrust into new horrors. There could be a reclusive writer who starts to experience real - life manifestations of the dark stories he writes. Each character, whether they are victims, heroes, or something in between, adds to the overall atmosphere of horror and mystery in the different tales within the graphic novel.
Typically, the main characters could be the star players from different teams, like the orc blitzer who is known for his powerful tackles or the elven runner who is super fast.
The Blood Angels themselves are central characters. Their leaders, like Dante, are likely to be main characters. He is a powerful and respected figure within the Blood Angels chapter.
I'm not sure as I haven't read it. But they could be people who are somehow related to the 'old blood' concept, like an old bloodline's heir.
I don't know who the main characters are as I haven't read this graphic novel. It could be a detective who is investigating cases related to the fake blood. Maybe a young artist who discovers something strange about the fake blood.
I don't know for sure as I haven't read it. But usually in a graphic novel, the main characters are the ones who drive the story forward. They could be family members if the 'blood ties' are important to the plot.
The main characters might include an imperial ruler who is at the center of the blood - filled power struggles. There could also be a group of knights or soldiers who are loyal to different factions within the empire. Maybe there is a mysterious figure, like a seer or a mage, who has the ability to foresee the end of this empire of blood and tries to influence the events to prevent more bloodshed. Without reading it, it's all speculation though.