A more complex plotline could be the sacrifice of a character's dreams. Weiss, for instance, might sacrifice her long - held dream of reclaiming her family's company and status in Atlas to stay with her team and fight against a greater evil that threatens Remnant as a whole.
One possible plotline could be a character sacrificing their own powers to save their friends from a powerful enemy. For example, Ruby might give up her Silver - eyed Warrior abilities to stop Salem's latest scheme and protect her team.
Another plotline could involve a sacrifice of a relationship. Maybe Blake sacrifices her relationship with Yang to complete a dangerous mission that would otherwise put Yang in harm's way. In 'rwby sacrifice fanfiction', there could also be the sacrifice of a character's reputation. A character might be wrongly accused of something and accept the blame (sacrifice their good name) to protect someone else in the group.
Well, in some rwby mugetsu fanfiction, there might be a plotline where the characters have to adapt to a new world that combines the two settings. They could struggle with understanding different cultures and magic systems. Maybe Weiss has to learn how to use her Glyphs in a world where the rules of magic are more like those in Mugetsu. This would lead to her character growth as she overcomes these challenges.
One possible plotline could be a character facing public shaming in the RWBY universe, perhaps due to a failed mission or a misjudgment. Another could involve a character being humiliated in a social setting within the school or among their team.
Another plotline could involve the reincarnated character trying to change the fates of the main RWBY characters. They might know about certain events that are going to happen in the future of the RWBY story and work towards preventing tragedies or enhancing the characters' growth in different ways. Maybe they try to save Pyrrha from her doomed fate at the hands of Cinder.
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.
One interesting plotline could be a deeper exploration of the relationship between Ruby and Weiss. Maybe in the fanfiction, they face a new and powerful enemy together that forces them to rely on each other more than ever, strengthening their bond in ways not seen in the original series.
One interesting plotline could be a friendly sparring match that turns into a real test of skills and teamwork for both RWBY and JNPR. Maybe there are unexpected alliances formed during the fight.
One interesting plotline could be Roman teaming up with the main characters against a new common enemy. Maybe he has some inside knowledge that could help them defeat this powerful foe.
Perhaps there's a plotline where Summer's resurrection is part of a larger mystery. It could be related to an ancient evil that she was somehow involved with before her death, and now she's back to stop it. She might have to convince the other characters that she's really on their side and not some sort of imposter. The fanfiction could explore how the other members of Team RWBY react to her return, especially if they have mixed feelings about her being back.
Another plotline could be a death battle where a character from RWBY has to fight an alternate version of themselves. It would be a psychological and physical battle as they grapple with their own strengths and weaknesses in a different form.
One interesting plotline could be the exploration of the God of Light's past and his relationship with other deities in the RWBY universe. Maybe how he came to be and what his true intentions are for the world of Remnant.