Perhaps Bill Cipher enters Will's dreams and slowly manipulates his mind. As he 'gets' Will, he starts to change Will's perception of reality. Will, being a more innocent or naive character, might not realize what's happening at first. This could lead to a story where Will has to fight against Bill's control over his mind and soul, creating a tense and psychological plot.
One possible plot could be that Bill Cipher needs Will Cipher to complete a dark ritual. So, he devises a complex plan to capture Will. He might use his mind - bending powers to trick other characters into leading Will into a trap.
I'm not entirely sure specifically what that fanfiction is about. It could potentially be about Bill Cipher achieving or obtaining Will Cipher in some way, perhaps in a strange or otherworldly scenario within the context of the Gravity Falls universe. It might involve some sort of power play or a very unique plot device that only fans who have read it would know for sure.
One idea could be Bill Cipher getting trapped in a human form and having to navigate the strange world of human emotions and social norms. It would be a comical yet thought - provoking plot as he tries to understand things like friendship and love while still having his devious nature.
One possible plot could be that Bill takes Mabel to his dimension. There, Mabel has to use her wits and creativity to outsmart Bill. Maybe she befriends some of the strange creatures in Bill's realm who help her in her escape plan.
In a fanfiction, Bill Cipher could be a hidden power that was sealed away long ago in the Naruto world. When accidentally released, he starts to reshape the world according to his own chaotic vision. Naruto, with his unwavering belief in his friends and the power of the Nine - Tails, would be the one to stand up against Bill and try to return the world to normal.
One aspect of Bill Cipher and Dipper fanfiction is the exploration of their complex relationship. Bill is often depicted as a menacing and powerful entity, while Dipper is curious yet cautious. In many fanfictions, Dipper might be lured into Bill's schemes, creating a lot of tension and drama. It's a great way to expand on the personalities and potential interactions that were only hinted at in the original show.
One great Bill Cipher fanfiction is 'The Cipher's Game'. It has an interesting plot where Bill interacts with the main character in a dream - like world filled with strange and mind - bending challenges. The author does a wonderful job of capturing Bill's chaotic and mischievous nature.
Dipper Pines could be one of the main characters. He might be the one who first discovers Bill's transformation and tries to figure out if it's a trick or if Bill is truly changing. His inquisitive nature would make him a great foil to Bill's new human self.
I think Kakashi would also be a great character to pair with Bill Cipher. Kakashi is very intelligent and experienced. His encounter with Bill Cipher would be full of mind - games as he tries to figure out Bill's motives and powers while also protecting the village from Bill's chaos.
In the 'bill cipher meets black hat fanfiction', it could start with Bill Cipher getting bored in his own dimension and decides to explore other realms. He stumbles upon Black Hat's domain. At first, Black Hat is hostile towards this strange triangular entity. But Bill Cipher, being his glib self, tries to convince Black Hat that they could achieve greater things together. Black Hat, seeing the potential of Bill's powers, reluctantly agrees. Then they embark on a journey of causing chaos across different universes, with each having their own motives hidden beneath their new - found partnership. Their interactions would be filled with mistrust and power plays as they constantly try to one - up each other while still maintaining their joint goals of destruction and domination.