It's hard to say it's a popular genre. While the RWBY fandom is large and diverse, mind - control fanfiction with 'lemon' elements can be quite polarizing. Many fans are more interested in the core aspects of RWBY like the fight scenes, the relationships between the main characters, and the overarching plot against Salem. Fanfiction that focuses on these main elements tend to be more popular, so this particular type might not be as widespread.
A magical artifact might be the source. For example, a long - forgotten amulet that was created by an ancient civilization with the power to influence Grimm behavior. If a character discovers this amulet and figures out how to use it, they can gain control over the Grimm. This could involve a complex process of deciphering the amulet's inscriptions and learning the proper incantations or rituals associated with it.
An 'oc' (original character) in a RWBY fanfic with a time - control semblance can bring a lot of interesting plot developments. For example, they could use this power to change the outcome of battles, prevent disasters, or even explore different timelines. It also adds a layer of complexity to the character's relationships as they might be able to manipulate time to save or harm others. However, it needs to be well - balanced so as not to make the character overly powerful.
One common theme is the struggle for free will. The characters who are mind - controlled often have to fight against the control to regain their autonomy. Another theme is the power dynamics. It shows how those with the ability to mind control can manipulate situations and others. For example, villains might use it to gain an upper hand in battles or to achieve their evil plans.
One interesting RWBY mind control fanfiction could be one where a character is forced to fight against their will due to mind control. For example, in some fanfics, a villain might use a special device or power to take over a main character like Ruby and make her turn against her friends. This creates a lot of drama and conflict as her friends have to figure out how to break the mind control and bring her back to her normal self.
Perhaps a fanfiction where a long - lost ancient magic resurfaces in a character, enabling them to control Grimm. The character then has to struggle with the moral implications of using this power, as controlling Grimm is generally seen as a very dark and dangerous ability in the RWBY universe. They might try to use it for good, like stopping Grimm attacks without harming the Grimm, but face opposition from others who don't believe it's possible to use such a power benevolently.
They can start with an accident or an experiment gone wrong. Maybe a student at Beacon was working on a project related to aura manipulation and it accidentally turns into a mind - control device. This device then affects one of the RWBY team members, say Blake. The story would start by showing the chaos that ensued right after the accident and how Blake starts to act out of character due to the mind control.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of RWBY fanfictions, and you can use the search function to specifically look for ones related to body control.
A great RWBY body control fanfiction might explore the idea of body control in relation to the characters' Auras. Maybe a character has an accident that messes with their Aura's connection to their body control, and they have to relearn how to move and fight. This could involve a lot of character development as they struggle and eventually overcome this obstacle.
Yes, there are some RWBY fanfictions related to mind control that are not adult - themed. These often explore the concept in a more story - driven and less inappropriate way, such as using mind control as a plot device for battles or character development.