In a 'rwby switched roles fanfic', a great plot could involve Ruby as Yang. She'd be the strong, brash fighter, not afraid to jump into a fight headfirst. Yang, in Ruby's role, would be the innocent - looking but actually very powerful fighter. She'd use her charm to fool opponents into underestimating her. Weiss and Blake could also switch, with Weiss being the more shadowy, cat - like character and Blake as the haughty, aristocratic type.
One interesting plot idea for a RWBY fanfic is to focus on a character's struggle with their semblance going out of control. This could lead to all sorts of problems, from accidentally harming their friends to attracting hordes of Grimm. Another plot could be a tournament - style story where teams from different kingdoms come together, not just the main RWBY teams. There could be rivalries, unexpected alliances, and new friendships formed during the tournament. Also, a plot where the characters discover a hidden power within the Dust that could change the balance of power in Remnant.
I think Ruby would be really interesting if she took on Weiss's role. Ruby is so used to being the free - spirited leader, but as Weiss, she'd have to deal with all the expectations and formalities that come with being an heiress. It would be a huge change for her character and would force her to grow in different ways.
An interesting plot for a 'Switched at Birth' OC fanfic could involve an OC who is a journalist. They start investigating the story of the switched at birth incident for a school project or a local newspaper. As they dig deeper, they uncover secrets that not only affect the two families but also the hospital staff involved. This OC could also have a personal connection to one of the families, like being a long - lost relative of one of the parents, which adds more complexity to the story.
One idea could be that Hermione is switched with a pure - blood witch from a dark family. She then has to navigate the different values and expectations of this new family while still holding onto her own intelligence and thirst for knowledge. For example, she might be expected to participate in dark magic studies, but she uses her wits to find a way around it and secretly study light magic instead.
One idea could be exploring a new character's journey in the RWBY world. Maybe a character from a different kingdom who has unique abilities and must team up with the main RWBY characters to face a new threat. Another plot could involve time travel, where a character goes back in time to change a crucial event in RWBY's history. A third idea is a story focused on the Grimm's origin and how to potentially find a way to permanently stop their creation.
Maybe in the RWBY Future Fanfic, the characters could explore new kingdoms. They might discover hidden secrets about the origin of Dust and how it can be harnessed in more powerful ways. This could lead to new power-ups for the characters and also introduce new allies and enemies.
A plot could revolve around a new threat that affects both universes. So, the RWBY characters and the Titanfall pilots have to team up. The RWBY characters' creativity in combat combined with the Titanfall pilots' skills in mech combat could make for an epic battle against the common enemy. There could be some cultural clashes and misunderstandings at first, but as they get to know each other, they become a formidable force.
One idea could be exploring an alternate universe where the characters' roles are reversed. For example, the villains are the heroes and vice versa. Another plot could involve a new Grimm threat that is unique to the Mirrorverse, forcing the RWBY characters to adapt their fighting styles. Or perhaps a story about a character getting lost in the Mirrorverse and having to find their way back while facing mirror versions of their friends and foes.
One plot idea could be that a character from RWBY gets transported to the world of Overlord. They might have to navigate the power - hungry and often dangerous world, trying to find a way back home while also dealing with the various powerful beings in Overlord. For example, Ruby could end up in the Tomb of Nazarick and have to figure out how to interact with the Floor Guardians without getting killed.
One idea could be exploring a different backstory for one of the main characters. For example, Ruby could have grown up in a more isolated part of Remnant and had to learn combat skills in a very different way. Another could be a time - travel plot where a character goes back in time to change a major event in the RWBY universe. Maybe they try to prevent the fall of Beacon earlier in the story, which would have a huge impact on all the characters and their relationships.