Who could be the main characters in Warhammer 40k vampire fanfiction?

The Empress herself is of course a main character. Often, you'll also find Space Marines, as they are a significant part of the Warhammer 40k universe and interact with the Empress in various ways. Imperial Guardsmen may also be present, depending on the plot of the fanfiction.

The Primarchs could be main characters interacting with her. For example, if she had a vision for the future of the Imperium, she might consult with the more intelligent and far - seeing Primarchs like Guilliman. Another would be the Inquisitors. They are tasked with rooting out heresy and protecting the Imperium, so they could have important meetings with her to report on threats or seek her guidance. And of course, the Custodes. As her personal bodyguards, they would have constant interaction with her in many fanfiction scenarios.

One of the main characters is Ciaphas Cain. He is from the 'Gaunt's Ghosts' series. He is a bit of a reluctant hero, always getting into and out of trouble in the most interesting ways.

In Warhammer 50k fanfiction, characters like the Sisters of Battle are quite popular. They are strong, devout warriors, and their stories of faith and combat can be really inspiring. There are also Inquisitors who are often central characters. They have the power to investigate and root out heresy, and their complex personalities, some being more noble and some being more morally ambiguous, make for great storytelling. Additionally, the Ork warbosses can be popular as they bring a lot of chaotic and violent energy to the stories.

Horus Lupercal is a very popular character. His fall from grace and the events leading up to it are often the focus of fanfictions. Another popular one is Magnus the Red. His connection to the warp and his attempts to warn the Emperor make for great story material. Also, Leman Russ is popular. His no - nonsense attitude and his relationship with his legion are often explored in fanfic.

I don't know for sure, but it could be the Space Marines. They are often central characters in Warhammer 40k stories.

Space Marines can also be main characters. They might be tasked with protecting an STC site or escorting Tech - Priests to retrieve an STC. Their combat skills are crucial in fending off threats.

The Inquisitors can be very interesting characters in Warhammer 40k Fanfiction. They have this power to hunt down heretics and xenos, and their investigations can lead to all kinds of crazy adventures. Some Inquisitors are on the edge of heresy themselves, which adds a layer of complexity and intrigue to their stories.

One popular character is Yvraine. She is often depicted in fanfiction as a powerful figure leading the Ynnari. Her unique abilities and her role in the Eldar's struggle for survival make her a fascinating character to write about.

In the Warhammer 40k War of Secrets novel, it's possible that there are main characters from different factions. There might be a tech - priest from the Adeptus Mechanicus who is trying to unlock some technological secrets. Or perhaps a Commissar who is involved in uncovering some political secrets within the Imperium. There could also be a Chaos cultist whose actions drive part of the story as the Imperium tries to root them out.