The Argeneau series novels often touch on the theme of power as well. There are different levels of power among the vampires, whether it's physical strength or political influence within their vampire society. Also, the struggle between good and evil is a theme, as some vampires may use their powers for less noble purposes while others strive to protect and do good.
Lynsay Sands has created some really interesting characters in this series. One popular character is Argeneau himself. He's a complex vampire with a long history. Another is his love interest, whose name I can't quite recall at the moment but she brings a lot of humanity to the story.
One popular story could be about a new vampire in the Argeneau world trying to adapt to modern society while hiding their true nature. Another might focus on a forbidden love between an Argeneau vampire and a human from a rival vampire - hunting family.
Lukian Argeneau is often a favorite. His strong and mysterious nature makes him a great character to build fanfiction around.
I'm not sure specifically as I haven't read it yet. But usually in an Argeneau novel, there are members of the Argeneau family which are likely to be main characters.
Not having read the book, it's difficult to name the exact main characters. But we can assume that the titular immortal angel is a main character. There could be other important characters such as a mentor - like figure who guides the angel in the ways of the Argeneau world, or a sidekick - type character who helps the angel on their adventures. There might also be a villainous character who is envious of the angel's immortality or has some sort of vendetta against them within the context of the Argeneau story.
One of the main themes is probably heroism. The characters in the Cadian Series Novels often face great challenges and show remarkable courage. Another could be loyalty, as they are likely to be loyal to their comrades and their cause. And there might also be a theme of survival in the harsh environments described in the novels.
Power and politics are main themes. It shows how different groups struggle for power in a galactic empire.
The Brother Series 2014 novels also touch on the theme of identity. Brothers in these novels sometimes struggle with their own identities, especially in relation to each other. They may have different personalities and goals, but they are still connected by blood. This exploration of identity adds depth to the characters and the overall story. For instance, one brother may be more adventurous while the other is more reserved, and they have to find a way to understand and accept each other while still maintaining their own sense of self.
Another possible theme could be the exploration of different cultures. In the agniputra series novels, the settings could be in diverse places with different cultures. This allows the readers to learn about new traditions, beliefs, and ways of life. The characters may interact with these cultures, sometimes facing conflicts due to cultural differences, and other times finding common ground and building relationships.
Survival is a major theme. The characters in metro series novels are constantly fighting for their lives in a harsh post - apocalyptic metro environment.