A major theme is the balance between good and evil. The Maidens' powers can be used for different purposes, and fanfics show them either being tempted by evil or firmly on the side of good. Legacy is also common. How the Maidens pass on their powers and what kind of mark they leave on the RWBY world is often explored in these fanfics.
Chivalry is likely to be a common theme, given the presence of a knight. It could involve the knight protecting the maidens in various dangerous situations in the RWBY universe.
Well, one interesting plot could be the relationships between the four maidens and how they interact with the main RWBY characters. Maybe they team up to fight a common enemy.
Well, the plot could involve the knight protecting his maidens from various threats in the RWBY universe. Maybe they are on a quest to find a powerful relic, and along the way, they face Grimm attacks. The knight uses his combat skills and the maidens might have special abilities too, like one could be a healer among the maidens, and they all work together to survive and reach their goal.
Perhaps the plot involves the knight being from a different land or group in the RWBY world, and the maidens have special powers or knowledge. The knight's duty is not only to keep them safe but also to help them fulfill a prophecy or a mission. They might encounter other characters from RWBY who either help or hinder their progress.
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.
One common theme is the exploration of Tukson's true nature. Since he was not fully developed in the original RWBY, fanfics often dig deeper into who he really was. Another theme is his relationship with the other characters in the RWBY world, whether it's friendship, rivalry, or something else.
One common theme is family. Since Weiss and Winter are sisters, a lot of fanfics explore their family dynamic, like how they support or misunderstand each other.
A common theme is power struggle. Lucifer, being a powerful figure, often gets into power - related conflicts with the RWBY characters who also possess various forms of power.
One common theme is identity. Since Neo has a rather mysterious past, many fanfics explore who she really is. Another is revenge. Given her actions in the RWBY series, some fanfics have her seeking revenge or others seeking revenge on her.
One common theme is the distortion of the familiar RWBY settings. For example, Beacon Academy, which is usually a place of learning and growth, can be turned into a haunted and dangerous place. Another theme is the corruption of the characters' powers. Their abilities might be twisted in a way that becomes a source of horror rather than strength. And the threat of the unknown, like strange creatures or forces emerging from the uncharted parts of Remnant.