One idea could be exploring new stand abilities inspired by RWBY characters' weapons or semblances. For example, a stand based on Ruby's Crescent Rose could have the ability to manipulate time briefly like Ruby can move at high speeds. Another idea is to create crossovers within the RWBY universe using stands, such as having a stand user from a different part of Remnant interact with the main RWBY team and their battles.
One idea could be a fanfic that explores the backstories of minor characters in RWBY more deeply. For example, you could focus on a character like Velvet and create a story about her training before coming to Beacon. Another could be a crossover within the RWBY universe itself, like a team-up between different schools' teams that we haven't seen much of in the official series.
For a 'rwby breeding fanfic', you might look at the idea of cross - species breeding if there are non - human characters in RWBY. Maybe a Faunus character breeds with a human - like character. This could bring up all sorts of interesting cultural and physical differences in the offspring. The fanfic could explore how the society in RWBY reacts to such cross - breeding, whether there is acceptance or discrimination, and how the characters themselves deal with the consequences of their actions.
You could base the fanfic on a quest. The RWBY team is hired by a DND - like noble to retrieve a powerful artifact. This artifact could be something that has the power to change the balance in Remnant (the RWBY world). Along the way, they encounter classic DND monsters like dragons and beholders. They also meet different DND races, such as elves and dwarves, and have to form alliances. Ruby might be the leader in this quest, using her quick thinking and charisma, while Weiss uses her knowledge of magic and lore to figure out clues.
One idea could be exploring the backstories of minor characters in more depth. For example, you could focus on a character like Velvet and her experiences at Beacon Academy before the main events of RWBY. Another idea is to create an alternate universe where the Dust technology has different properties or uses. Maybe in this AU, Dust can be used to create temporary portals to different locations.
A prequel could center around the formation of the different kingdoms. Explore the political tensions and alliances that were made. You could also show how the Dust was discovered and how it became such an important resource. This would give readers a better understanding of the world of RWBY before the events of the main series.
Well, you could do a crossover where the Danganronpa students are transported to the RWBY world. They'd have to adapt to the Grimm and the Huntsman - Huntress system. Or perhaps create a scenario where the two universes are merged, and there are new rules for survival. The characters from both series would have to form alliances based on their skills and personalities.
Well, you could do a fusion fanfic where the characters fuse due to some ancient magic or a powerful relic. Maybe there's a relic that when activated, causes two characters to fuse together. You could have a plot where the fused characters have to figure out how to control their new powers and how to separate themselves. And they might face challenges that only their combined abilities can overcome, like fighting a super - powerful Grimm that normal teams can't handle.
Well, one idea could be the use of nuclear energy in the RWBY universe to power new types of weapons. For example, a weapon that harnesses nuclear fusion to create extremely powerful blasts. Another could be the exploration of how nuclear power affects the Grimm. Maybe the radiation from nuclear sources either attracts or repels them in unique ways.
One idea could be a fanfic that focuses on creating new RWBY - inspired brand logos for the different kingdoms in the RWBY universe. For example, you could design a brand for Vale that incorporates elements like the white fang and the local wildlife.
One idea could be to explore the backstory of a minor villain. For example, the White Fang members. You could show how they were recruited, what drove them to join the group. Maybe they had a family that was wronged by humans, and this led to their radicalization.