A cool concept for an RWBY Jekyll and Hyde fanfiction would be to base it on Blake. Imagine that due to some sort of experimental Faunus technology, Blake's shadow self becomes a separate entity, much like Jekyll and Hyde. Her normal self is still the freedom - fighting Faunus, but her 'Hyde' self is a more ruthless hunter. This could lead to internal conflicts within Blake as she battles with this new aspect of herself and tries to keep it from harming her friends.
In RWBY, there's the theme of the struggle for a better world. In a Jekyll and Hyde fanfiction related to RWBY, this could be reflected in a character's transformation. For instance, if a character like Oscar is given a power that causes a Jekyll and Hyde - type situation. His 'Jekyll' side could be focused on the peaceful, diplomatic ways to achieve a better Remnant, while his 'Hyde' side might be more radical and willing to use force. This would create an internal struggle within the character, similar to the internal struggles of RWBY characters in their fight for a better world, while also showing how different aspects of one's personality can approach the same goal in different ways.
Secrecy is another theme. Jekyll's secret about his transformation into Hyde is a central part of the story. In the fanfiction, Utterson's attempts to either uncover or protect that secret are often explored. How he deals with the knowledge that his friend is hiding something so huge is a major part of the narrative in many of these fanfictions. This can lead to a lot of tension and drama in the relationship between Utterson and Jekyll.
Basically, the tale of Jekyll and Hyde centers on Dr. Jekyll's experiments with a concoction that leads to his transformation into the evil Mr. Hyde. It delves into the darker side of human personality and the consequences of unleashing it.
In Jekyll and Hyde fanfiction with time travel, it could be about Hyde traveling back to prevent his own creation. Maybe he realizes the chaos he has caused and wants to change the past. This would add a whole new layer of complexity to the story, as he has to deal with his own duality in a different time period.
One popular piece might be 'The Unseen Bond' which delves deep into the complex relationship between Utterson and Jekyll in the context of the Jekyll and Hyde story. It really captures the essence of their friendship and the underlying tensions.
The 'Jekyll and Hyde' story is centered around the concept of split personality. Dr. Jekyll represents the civilized, good - natured side. He's a man of science, respected in society. However, when he becomes Mr. Hyde, it's like a completely different being emerges. Hyde is brutish, immoral, and has no regard for the norms of society. This transformation is not just physical but also mental and moral. The story explores the consequences of trying to tamper with the fundamental nature of human duality.