Maybe in the fanfic, a villain has the stop - time ability. This causes chaos as they start stealing important artifacts while everyone else is frozen. The RWBY team has to find a way to counter this power, perhaps by teaming up with a time - wizard who teaches them how to move in stopped time.
One idea could be a character using the time - stop ability to save a teammate from a deadly attack. For example, Ruby could stop time to move Weiss out of the way of a Grimm's strike. Another could be a villain using it to set up a complex trap that the heroes have to figure out how to escape from once time starts again. Maybe they freeze time to manipulate the environment and make it more dangerous for the RWBY team.
Maybe a character from the future RWBY world travels back to the time when the Huntsman academies were first founded. They could introduce new fighting techniques or ideas that were developed in their time, which would have a huge impact on how the early Hunters and Huntresses are trained.
One interesting concept could be the exploration of character relationships during the time stop. For example, how characters might interact or reveal hidden feelings when time is frozen. Another could be the strategic use of the time stop ability in battles. Characters might use this time to plan their next moves, analyze their opponents' weaknesses, or set up elaborate traps.
Another interesting concept is if an enemy from the past is brought to the present in a time travel accident. Maybe Salem is accidentally brought forward in time. This would force the RWBY characters to face her with their current skills and knowledge, leading to intense battles and strategic planning as they figure out how to send her back or defeat her in this new time.
Well, perhaps the OC's time loop semblance only activates when they are in great danger. So, in a battle against a powerful Grimm, they start looping. In each loop, they try different strategies to defeat the Grimm, and along the way, they discover new abilities of their teammates. They could also use the time loop to prevent a major disaster from happening in Vale, like a terrorist attack planned by Roman Torchwick.
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.