Well, perhaps a fanfic where a character has an OP power of telekinesis that is so strong it can move entire buildings. This character could be an outcast at first because their power seems too dangerous. But as the story progresses, they learn to control it and use it to defend Beacon Academy during a Grimm invasion. They could single - handedly hold off hordes of Grimm by using debris from the destroyed parts of the academy as weapons.
One idea could be a character from our world being reincarnated into the RWBY universe with an OP power like the ability to control time. They could use this power to prevent major disasters in the story, like stopping Salem from causing chaos in the early days. Another could be a character who has the power to instantly heal any wound, which would change the dynamic of battles as they could keep their teammates alive no matter how severe the injury.
One idea could be that the male OC has a unique semblance related to time manipulation. He could use it to outwit the villains in RWBY's world. For example, he might freeze time briefly during a battle to analyze the enemy's moves and then counterattack effectively.
One plot idea could be Naruto and Hinata going on a mission together in a new, mysterious land. They face challenges that test their skills and also their relationship. Another could be a story set in an alternate universe where Naruto isn't the jinchuriki and he and Hinata have a more normal, but still exciting, relationship as they try to prove themselves in the ninja world.
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.
One idea could be a character getting a tattoo that has a hidden power. For example, a RWBY character might get a tattoo that glows when danger is near, like a warning sign. Another plot idea could be a story centered around a tattoo artist in the RWBY universe who creates unique tattoos for the Huntsmen and Huntresses, and each tattoo gives them a special ability or connection to the Dust energy. Maybe a tattoo that allows a character to communicate with Grimm in a strange way, adding an interesting twist to the story.
One idea could be exploring new Grimm species in the RWBY GP fanfic world. Maybe there are Grimm that can blend into the environment in a more advanced way, like turning into man - made structures to ambush Huntsmen and Huntresses. Another plot could revolve around a new character who has a unique weapon design that combines different Dust types in an unorthodox way, and they have to prove themselves in the academy.