A fanfiction about their sisterly bond could start with Pyrrha having doubts about Cinder being her sister. But as she investigates, she finds evidence that they are indeed related. Cinder, initially cold towards Pyrrha, starts to warm up as Pyrrha shows her unconditional love. They could then start training together, sharing their knowledge of combat and semblances. Their sisterly bond would not only change their individual characters but also have an impact on the events in the RWBY universe, as they would now fight together for a common cause.
In a fanfiction centered around their sisterly bond, Cinder and Pyrrha might have a telepathic connection due to their sisterhood. This could be used in battle situations, like when Pyrrha is in trouble, Cinder senses it and comes to her rescue. Their bond could also be a source of inner strength for both of them, especially in the face of the great challenges in the RWBY world.
One possible fanfiction idea could be that Cinder and Pyrrha are long - lost sisters separated by some dark event in their past. In this fanfic, Cinder could be on a journey of redemption after realizing her sister is Pyrrha. Pyrrha, on the other hand, might struggle with the idea at first but then come to accept Cinder. Their relationship could develop as they face common enemies in the RWBY universe.
Cinder is often portrayed as complex. Her usual cold and calculating nature might be softened in fanfiction when it comes to her relationship with Pyrrha. She could show vulnerability that she doesn't usually display. Pyrrha, on the other hand, is typically shown as the more empathetic and moral one. She might be the one to reach out to Cinder and try to understand her motives.
One possible storyline could be a redemption arc for Cinder through her relationship with Pyrrha. Maybe in an alternate universe, Cinder realizes the error of her ways and Pyrrha helps her to change. They could start as enemies but gradually come to understand each other.
It would greatly affect her relationship with Emerald and Mercury. They might be confused as to why Cinder is so interested in Pyrrha. Emerald could feel jealous, thinking that Cinder is replacing her with Pyrrha in some way. Mercury, on the other hand, might just be indifferent or find it strange.
In a story about sisterly bond, there might be a situation where the sisters have different personalities but still love each other deeply. For example, one sister is outgoing and the other is shy. The outgoing sister helps the shy one make friends and the shy sister gives the outgoing one a sense of calmness in return.
One possible plotline could be that Cinder starts off secretly admiring Pyrrha's combat skills. Maybe she spies on Pyrrha's training sessions and tries to learn from her techniques. This could lead to a situation where Cinder has an internal struggle between her admiration for Pyrrha and her own dark motives in the main RWBY storyline.
The sisterly bond in stories is important as it often represents loyalty. Sisters in stories usually stand by each other no matter what. It gives readers a sense of family and unity.
A strong sisterly bond provides emotional support. Sisters can be there for each other during sad times, like after a breakup or when facing family issues. They can offer a shoulder to cry on and words of comfort.
Cinder might become more adaptable. In the RWBY world, she is used to a certain set of rules and powers. But in the Halo universe, she has to quickly learn new things. So she could become more open - minded about different ways of fighting and surviving.
Often in fanfictions, the sisterly bond is strengthened by their common experiences. They might have all faced some kind of danger or hardship together. This would lead to a deeper understanding and connection between Bella, Alice, and Rosalie, making their relationship as sisters more complex and interesting.