Not having read 'the maidens a novel', it's difficult to determine the main characters. But it's reasonable to think that the maidens themselves are the central focus. There could be different types of maidens, for example, a bold and adventurous maiden, a shy and reserved one, etc. And they may interact with characters such as a wise old woman who gives them advice, or a young man who causes some sort of conflict or romance in their lives.
Since I haven't read it, I can't say for sure. But I assume the 108 maidens are the main characters, and there might be some other supporting characters like wise elders or powerful adversaries.
Since I'm not familiar with the 'the dark maidens light novel', I can't tell you exactly who the main characters are. But typically in a light novel, the main characters are the ones around whom the story revolves. So in this case, it could be the 'dark maidens' themselves, and there might also be some supporting characters like friends, family members or foes related to them.
The RWBY team - Ruby, Weiss, Blake, and Yang - could also be important characters in the 'rwby four maidens fanfic'. They might interact with the maidens, either as allies or in some cases, having to resolve conflicts. For example, if there is a misunderstanding about the maidens' powers or intentions, the RWBY team would be there to figure things out.
I'm not familiar with this novel enough to name the main characters. But it's likely that the maidens who play key roles in the major events related to the overall destiny of the group of 180 are the main characters. They could be the ones with unique abilities or special relationships that drive the story forward.
In the 'infinite apostle and the twelve war maidens novel', the infinite apostle is surely a key character. He or she is probably the driving force in the story, perhaps with some extraordinary abilities that set them apart. The twelve war maidens are also main characters. They might represent different aspects such as different elements or virtues. For example, one maiden could be associated with fire and be fierce and passionate, while another could be linked to water and be more calm and nurturing. Their interactions with the apostle and among themselves form the core of the story's character dynamics.
Jaune is probably the protagonist around whom the story revolves. As for the Maidens, they are likely characters with special powers. They could be a group of female characters with different personalities and abilities related to elements like fire, water, earth and air. Their interactions with Jaune would be a major part of the story, as they work together or face conflicts within the story's universe.
As I haven't read it, I can't say for sure. But usually, the ones with unique powers or complex backstories are interesting.
The knight would obviously be one of the main characters. He could be a new character created specifically for the fanfic, or perhaps a reimagined version of an existing RWBY character with knight - like qualities. The maidens would also be main characters. They could be based on the RWBY girls, or entirely new characters with unique abilities and personalities.
Here, I recommend the Exquisite Seven Absolutes and the Seven Absolutes Demonic Sound Zither. Both books have plots about the Seven Absolutes. I hope you like my recommendation. Muah ~
The characters included the male lead, Nolan El, the female lead, Amber, Sarah, Nilai, Reina, Blood Princess, and Blazing Spring. "I, the Lord of the Sea Maidens!" [Author: Autumn Thoughts Halfway. It is a fantasy/otherworldly novel with transmigration, self-discipline, relaxation, Shuraba, and funny elements.] [User recommendations: Western Fantasy + Semi-Invincible + Lord Farming + Cthulhu] Most lighthouses in the sea were built by pioneers to avoid risks and guide navigators. It was said that each lighthouse corresponded to a special sea area and an ancient inheritance, such as [Amber] on the Sunset Sea,[Silver Flint] on the Mirror Sea,[Xie Zhong] on the Ember Sea... The sea woman who inherited these mysterious powers was cursed by the sea. As the ability was used, the curse would accumulate in the body of the sea woman. Once it exceeded the threshold, they would degenerate into a natural disaster and become a monster that destroyed the world. Unfortunately, after Nolan transmigrated to such a world, not only was he sent to an isolated island, but he was also accompanied by a sea girl who was about to fall. Fortunately, not only could he resolve the curse on the sea woman, but he could also absorb the curse to strengthen himself. However, there was a very serious consequence. "What if more and more sea girls gather around me? Waiting online, very urgent!" -- "Okay, everyone, look at me! I repeat, I, Noren Aiur, am the Lord of the Sea Maidens! Not the king of soft rice!" I hope you will like this book.