A fanfiction could also explore what would happen if Starkiller's memories were wiped and he was found by the villains in RWBY. They could try to use him as a weapon against the Huntsmen and Huntresses, but his sense of justice gradually resurfaces as he interacts with the people of Remnant.
One idea could be a crossover where Starkiller's powers are introduced into the RWBY universe. Maybe he teams up with Team RWBY to fight a new, powerful Grimm that is immune to normal Huntsman attacks. His lightsaber skills and Force abilities would add a new dynamic to the battles.
The combination of two different universes. Starkiller comes from his own universe with his set of powers and abilities, and when put into the RWBY world, it creates a whole new dynamic. It's exciting to see how his skills interact with the Huntsmen and Huntresses in RWBY.
One interesting idea could be a crossover of different timelines within RWBY. For example, characters from the past meet the current ones and have to deal with the differences in their worlds. Another could be a crossover of different teams in unexpected ways, like Team RWBY having to team up with a rival team to face a common enemy that is more powerful than any they've faced before. And sometimes, there are crossovers that involve alternate versions of the characters, where their personalities or abilities are slightly different, which can lead to very unique and engaging storylines.
Perhaps Starkiller discovers a long - lost Jedi power that was thought to be extinct. He then has to learn how to master it while being hunted by the Empire. This could involve him seeking out ancient Jedi holocrons for guidance.
One idea could be a crossover where a character from RWBY gains the powers of Dishonored's Corvo. They could use the blink ability to quickly dodge attacks in battles against Grimm. Another idea is to have a setting where the world of RWBY is affected by the plague from Dishonored, and the characters have to find a cure while dealing with political unrest.
One idea could be a crossover where The Punisher teams up with RWBY characters to take on a new, powerful criminal organization in Remnant. He could bring his unique combat skills and no - nonsense attitude to the mix.
One idea could be to explore a crossover between RWBY and Darkwatch characters. Maybe Ruby could team up with a Darkwatch hunter to fight a new kind of Grimm that has some vampiric abilities. This would create a really unique dynamic as they combine their different fighting styles and powers.
One idea could be focusing on team strategies for different combat scenarios in RWBY. For example, how Team RWBY might plan to take on a powerful Grimm that has unique abilities. Another could be about the strategic use of Dust in battles, like creating new combinations or ways to deploy it for maximum effect. And a third idea could be exploring the strategic alliances and rivalries between different teams at Beacon Academy.
One idea could be to have Ainz Ooal Gown from Overlord end up in the RWBY world. He could be seen as a powerful new force, and his magic and strategic mind would create a lot of interesting scenarios. Maybe he'd form an alliance with one of the academies, or be seen as a threat by Salem and her forces.
An OC in RWBY fanfiction could be a character who is a master of stealth. They could use their skills to gather intelligence for the teams at Beacon Academy. Their backstory could involve growing up in a family of thieves, but they decided to use their abilities for good. They might have a Semblance that allows them to become invisible for short periods of time, but it has a drawback like draining their Aura quickly. This OC could interact with characters like Blake, who also has some stealth - like abilities, and they could learn from each other.
For RWBY OC fanfiction, you could make an OC who has the power to manipulate time on a small scale. This would be a really cool ability in battles, being able to slow down opponents or speed up oneself. Another idea is to have an OC that is a faunus with a very rare animal trait, like a phoenix - like faunus. Their story could revolve around hiding their true nature because of discrimination. And an OC that is a transfer student from a far - off land with a completely different fighting style compared to the students at Beacon Academy would also make for an exciting story.