Well, a plot could be centered around an ancient tech that was hidden away because it was too powerful. The characters accidentally stumble upon it. For example, it could be a technology that can open portals to other dimensions. They then have to deal with the consequences of opening these portals, like new and dangerous enemies coming through. Also, the fanfic could explore how this ancient technology was created in the first place. Was it made by the same people who created the Dust? Or was it from an even more ancient civilization?
Some concepts might involve the relationship between the ancient technology and the Dust in RWBY. Maybe the ancient technology was designed to work with Dust in a more efficient way. Or perhaps it has the power to control or manipulate Dust in ways that are currently unknown. This could lead to new plot developments and power struggles within the RWBY universe.
One idea could be exploring the lost technologies of the ancient kingdom. Maybe the characters discover a hidden vault filled with advanced weapons or energy sources that were used in the past. Another could be delving into the political structure of the ancient kingdom, like if there were different factions or noble houses that vied for power.
Another interesting approach is to have a character bond with an ancient weapon in a unique way. For example, a character might find an ancient weapon that seems to have a mind of its own. As they interact, the weapon reveals its powers and secrets only to that character, and they form a special alliance to face a great threat in the RWBY universe.
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.