Perhaps a fanfic where a powerful and ancient relic is discovered in the game world. The RWBY characters must race against time and other factions who also want the relic. Along the way, they learn more about the history of their world and face challenges that test their bonds as a team. This would include exploring new areas, fighting new types of enemies, and making difficult choices.
A plot could revolve around a new tournament in the RWBY universe specifically for the new game. Characters from different academies form teams not only to compete but also to uncover a conspiracy that seems to be using the tournament as a cover. It would involve a lot of intense battles, strategic planning, and some mystery-solving.
One idea could be to explore an alternate universe where the characters have different semblances. For example, Ruby could have a semblance that allows her to manipulate time briefly instead of her speed. Another plot could focus on a new villain in the game's world who has the power to corrupt semblances, forcing the RWBY team to find a way to counter this new threat without relying solely on their usual powers. Also, a story about the backstories of the minor characters in the 'rwby the game' could be really engaging.
Create a plot that involves a mystery. Maybe there's a series of disappearances at Beacon Academy, and the characters have to solve it. Along the way, they discover secrets about the academy and its founders. This keeps the readers guessing and engaged.
You could include Winter Schnee. Her strict military upbringing and her relationship with Weiss can be a source of conflict and growth. Additionally, Mercury Black, with his acrobatic fighting skills and his loyalty to Cinder, can be used to show the darker side of the RWBY world and add some intense fight scenes to the fanfic.
One possible plot could be centered around Emerald's self - discovery. Since she has been through a lot in the RWBY series, in the fanfic, she could start to question her loyalty to Cinder after getting chipped. Maybe she meets a group of Huntsmen or Huntresses who show her a different way of life. They help her fix the chip, and in the process, she realizes the true nature of the villains she has been following.
Another plot idea could be to focus on the relationships between the RWBY characters during this 'New Divide'. Maybe there are internal conflicts within the teams because of the stress and danger. For instance, Ruby might start to doubt her leadership abilities, and this could cause a rift between her and Weiss. The fanfic could then be about how they overcome this and strengthen their bond again.
A possible interesting plot could be a new champion emerging from a small, unassuming village. This champion has a unique power that no one has seen before. He or she then decides to enter the championship not for glory, but to find out the truth about their past. Along the way, they make unlikely alliances with other champions, some of whom are initially their rivals. As they progress in the game, they face various challenges that test not only their physical strength but also their moral compass.
You can start by brainstorming an original concept that fits within the RWBY universe. Maybe think about creating a new character with a unique backstory and abilities. For example, a character from a far - off kingdom who comes to Beacon Academy with a secret mission.
One possible plot could be that the RWBY characters find themselves in the world of Grand Theft Auto 5. Ruby could be on a mission to stop some sort of criminal activity that is similar to the Grimm in her own world. She might team up with some of the GTA 5 characters who are initially skeptical of her but then come to respect her skills. Weiss could be trying to navigate the seedy underworld of the GTA 5 city while maintaining her elegance and composure, which could lead to some comical situations as she clashes with the rough - and - tumble locals.
One possible plot could be that the RWBY characters are recruited to join a space ship fleet on a mission to save a distant planet from an ancient evil. They have to adapt to the new environment of space and the technology of the fleet while still using their unique combat skills.
One interesting concept could be exploring the backstories of minor characters in the RWBY game universe. For example, delving into the past of a random hunter or Grimm. Another could be alternate timelines where different events occur, like if a major character had made a different choice during a crucial battle. Also, fanfics might focus on the relationships between characters in more depth, such as the unspoken bond between teammates that wasn't fully explored in the game.