One interesting plot could be Ruby sleepwalking into a mysterious area of Beacon Academy that she's never seen before. Maybe it's an old, forgotten part filled with secrets. Another plot could involve her sleepwalking during a Grimm attack and somehow unconsciously using her powers in a unique way to fend them off. For example, her scythe might move on its own to block attacks while she's asleep.
Ruby's sleepwalking might also lead to some misunderstandings. If she sleepwalks into Weiss's personal space, Weiss might initially think Ruby is being rude or inconsiderate. But once they figure out it's because of her sleepwalking, it could lead to a deeper understanding between them. Weiss might become more empathetic towards Ruby's involuntary actions, and they could become closer friends.
Some fanfictions might have a plot where Ruby's blindness is a temporary state caused by some dark magic or a powerful enemy's attack. During this time, she has to quickly learn to function without her sight. Her friends, like Weiss, Blake, and Yang, would be by her side, each using their own skills to support her. Weiss could use her glyphs to create paths or barriers that Ruby can sense, Blake could use her stealth to scout ahead and warn Ruby of any danger, and Yang could be her physical protector, ready to fight off any threats that come their way.
One possible plot could be Ruby trying to prove her innocence. Maybe she was framed for something she didn't do. For example, a powerful relic goes missing and Ruby is wrongly accused. She then has to embark on a journey outside of the school to find the real culprit and clear her name.
In the fanfiction, a possible plot could be that Si - as Ruby - discovers some long - hidden secrets about Ruby's family or the history of Remnant. This discovery could lead to a whole new set of adventures and challenges. For example, they might find a connection between Ruby's family and an ancient power that could change the fate of Remnant.
One interesting plot could be Ruby and Mercury teaming up against a common enemy. Maybe a new Grimm type that they have to figure out how to defeat together. Their different fighting styles, Ruby's speed and scythe - wielding skills combined with Mercury's acrobatic and martial - arts - based combat could make for some exciting action scenes.
One possible plot could be Ruby Rose trying to understand Salem's motives. Maybe Ruby, with her pure heart, believes there's a chance to redeem Salem. She could engage in a series of intense conversations with Salem, where Ruby tries to appeal to any good that might still be in her. This would be a great exploration of the themes of good versus evil and redemption.
One interesting plot could be that while sleepwalking, Peter Parker accidentally uses his Spider - Man abilities. He might swing between buildings unconsciously, causing chaos in the city. People are both amazed and worried as they see Spider - Man acting so strangely.
One popular plot is the 'unlikely allies' scenario. Mercury and Ruby, who seem to be from different worlds in RWBY, are forced to work together. This could be because of a powerful enemy that neither can face alone. Another plot is the 'redemption arc' for Mercury, where Ruby plays a key role in helping him see a different path. A third common plot is a 'mystery - solving' one, where they team up to uncover a secret in the RWBY universe, and in the process, their relationship develops.
One possible plot could be that Ruby is facing an overwhelmingly powerful enemy alone. Despite her best efforts, she is mortally wounded in the battle and dies heroically. Another could be that she sacrifices herself to save her friends from a deadly trap or a powerful Grimm attack.
One possible plotline could be Ruby being wrongly accused of a crime in Vale. She then has to use her combat skills and her wits to clear her name while also dealing with the real criminal who framed her. This could involve her team, RWBY, splitting up to gather evidence and facing various challenges along the way.