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.
Bill Cipher would probably be the more dominant character. His powers are not of this world. He can create and destroy entire universes if he wants. Black Hat, while very evil and powerful in his own right, is more limited to his own domain and the physical world in a sense. Bill Cipher can pop in and out of different dimensions, change the laws of physics, and manipulate minds on a grand scale. Even if Black Hat tries to outwit him, Bill Cipher can simply change the rules of the game. So, overall, Bill Cipher's almost god - like powers would likely make him the more dominant one in this fanfiction scenario.
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.
Well, in a 'sans meets bill cipher fanfiction', there could be some really interesting interactions. Sans, from Undertale, is known for his laid - back yet mysterious nature, while Bill Cipher from Gravity Falls is this chaotic and powerful entity. The fanfiction might explore how Sans would react to Bill's mind - games and manipulations. Maybe Sans would use his unique abilities like teleporting and bone attacks to counter Bill's tricks. It could also be a story of an unlikely alliance between the two, or perhaps a battle of wits and powers that keeps readers on the edge of their seats.
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.
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.
It's the personalities of the characters. Sans is a fan - favorite with his cool - headedness and dry humor. Bill Cipher is this all - powerful and unpredictable being. Putting them together in a fanfiction means there will be unexpected twists and turns as their personalities clash or, surprisingly, find common ground.
Well, one possible plot could be that Lincoln, being his curious self from 'The Loud House', stumbles upon a strange dimension where Bill Cipher exists. Bill, being his mischievous self, might try to trick Lincoln into making some wild deals. Maybe Lincoln has to find a way to outwit Bill to get back home to his family.
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.
He could be a mysterious outsider. Just suddenly appear in the Naruto world and start causing trouble. Maybe he's looking for something in the Naruto universe, like a powerful chakra source or a special jutsu. And the ninja have to figure out who he is and what he wants before he destroys everything.