Well, one possible plotline could be Ruby and Cinder being forced to team up in an unexpected situation. Maybe they have to face a common enemy that is far more powerful than either of them alone.
A more complex plotline could be a time - travel scenario where Ruby goes back in time and meets a younger Cinder. She tries to change Cinder's path, but in doing so, she risks changing the entire future of Remnant. This would involve a lot of twists and turns as Ruby has to navigate the consequences of her actions.
One interesting concept could be the exploration of their opposing natures. Ruby is often seen as pure - hearted and full of hope, while Cinder is more devious and power - hungry. In fanfiction, this contrast can lead to some intense character - driven stories where they either learn from each other or clash in more complex ways than in the original series.
If in fanfiction Cinder is Ruby, it would be a total game - changer. Ruby is the symbol of hope in RWBY, and Cinder is a symbol of destruction. So, this switch would create a really interesting narrative. The story could explore how Cinder, in Ruby's body or identity, would deal with Ruby's responsibilities. Would she try to uphold Ruby's values? Or would she slowly corrupt them? And how would the other characters react? They might initially trust her because she looks like Ruby, but as they start to notice the differences in her behavior, it would lead to a lot of conflict and drama.
Obviously, Ruby and Cinder are the main characters. Ruby is known for her optimism and combat skills with her scythe. Cinder, on the other hand, is a more complex and often villainous character with her own set of powers.
One interesting fanfiction could be about Cinder and Ruby having to team up temporarily to face a common enemy. In this story, Ruby's optimism might start to chip away at Cinder's cold exterior.
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.
Perhaps there could be a plot where Ruby has to keep her status as a Maiden a secret from her friends at first. This could lead to some interesting misunderstandings and internal conflict as she tries to protect them without revealing the truth.
A plotline could also revolve around Ruby's insecurities during pregnancy. She's always been seen as a strong and fearless leader, but now she might be worried about not being able to protect her child. The fanfiction could show her journey of overcoming these insecurities and growing into a more confident mother - to - be.
Another idea is a time - travel fanfic. Cinder travels back in time and meets a younger Ruby. She could try to manipulate Ruby into following a different path, but Ruby's strong will and sense of justice might resist. This would create a lot of conflict and interesting character dynamics as Cinder tries to change the future and Ruby tries to protect it.
One interesting plotline could be exploring Amber's powers in more depth and how Cinder might be affected or influenced by them. For example, Amber could have a hidden ability that Cinder discovers and tries to use for her own gain.
One great RWBY Ruby and Cinder fanfiction is 'The Unlikely Alliance'. It explores a scenario where Ruby and Cinder are forced to work together against a common enemy. The story does a great job of developing their characters in this new context.