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.
A cool concept for an RWBY fusion fanfic is to fuse characters from different generations. Say, fuse a current - day character like Jaune with a character from the past, like one of the great heroes in the RWBY lore. This could lead to interesting storylines where the modern - day values and fighting styles clash and blend with the old - school ways. The fused character would have to adapt and use the best of both worlds to face the threats in the RWBY universe.
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.
One idea could be that Bulma discovers a new technology that allows her to fuse with different characters' minds, not just their bodies in a traditional sense. She could fuse with Goku to understand his pure love for fighting and gain some of his combat instincts.
One idea could be that the Incredibles' superpowers are enhanced by the Avengers' technology. For example, Mr. Incredible could get a high - tech suit from Stark Industries that gives him even more strength and the ability to fly short distances. Another plot could involve the villains from both universes teaming up, forcing the combined heroes to work together in new ways. Maybe Syndrome teams up with Loki, and they create a device that can nullify superpowers, so the heroes have to find a way to stop it.
One idea could be a fusion between Deku and All Might. Imagine Deku having not just One For All, but also All Might's combat experience and charisma from the start. It would change the dynamic of his battles and his relationships with other characters. Another idea is fusing Todoroki with a water - based hero, which could enhance his ice and water abilities even more and lead to new and creative ways of using his quirk in combat and rescue situations.
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.
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.
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, a cool RWBY Shower Fanfic idea could involve a team bonding moment in the showers. Maybe the whole team is in a communal shower area (in a non - inappropriate way) and they start sharing stories and secrets. It could be a way to show their deeper relationships. Also, a fanfic could focus on a character like Nora, who might be singing really loudly in the shower, much to the amusement or annoyance of the others. And for Ren, it could be about him using the time in the shower to practice his calm and meditation, but getting interrupted by Jaune's clumsy entrance.
One idea could be a fanfic where the RWBY characters transform into animals. For example, Ruby could turn into a little red fox, with her speed and agility enhanced. Another idea is an animal - centered adventure where the team has to protect a magical forest full of rare and mythical animals. They might encounter a giant griffin or a group of intelligent ravens that can communicate secrets about the Grimm.