Well, it could be about a character in the RWBY universe discovering their inner power. Maybe it's a story where a previously overlooked character realizes they have some latent ability and then goes on an adventure to master it.
Perhaps it could also focus on some of the villains in RWBY but from a different perspective. They might be the ones who are also trying to harness or understand a certain power within themselves, which could add an interesting twist to the story as they are usually seen as just the antagonists.
Hermione and Ron might also be main characters. They are Harry's closest friends in the original series, and in a fanfic, they could play important roles in exploring the power within, maybe by using their knowledge and skills to help Harry discover and control new powers.
Perhaps it delves deeper into the power of friendship within the fanfic. In the Harry Potter world, friendship is a strong force, and this fanfic could show it in a different light, like how the friends' combined power within is greater than the sum of its parts.
The theme of friendship often emerges. Characters from both universes form new friendships and alliances. They learn from each other's strengths and weaknesses. It's like the Power Rangers might teach the RWBY characters some new combat strategies, while the RWBY characters could introduce the Rangers to the concept of semblances. There's also the idea of facing a greater threat. Whether it's a new super - villain or an ancient evil that awakens, the combined forces of the Power Rangers and RWBY characters are needed to save both their worlds.
One interesting concept could be the fusion of the unique fighting styles. In RWBY, there are various weapon-based combat styles, and Power Rangers have their own martial arts and teamwork - based combat. In a fanfic, seeing how these two different combat systems blend together can be really cool. For example, Ruby's scythe - wielding speed might be combined with a Power Ranger's acrobatic kicks in a creative battle sequence.
Ruby could be a great main character with an OP power. Imagine if she had the power to teleport short distances instantly. It would enhance her already amazing combat skills and make her even more effective in battle. She could use this power to surprise her enemies and quickly get to her teammates in need.
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.
A great one is 'The Silver - Eyed Awakening'. It really delves into the potential of the Silver Eyes power. It shows how the main character, who has the power, starts to understand its full capabilities. The story has some great action scenes where the power is used in unique ways against the Grimm.
Well, in a 'Power of a Single Rose RWBY Crossover Fanfic', perhaps the single rose is a symbol of a long - lost magic. The fanfic might revolve around a character finding this rose and unlocking powers that were forgotten in the RWBY world. The crossover part could bring in new races or technologies from another series that are related to the power of the rose. For example, if it's a crossover with a fantasy series, there could be elves or dwarves interested in the rose's power.