One idea could be that Mabel discovers a way to communicate with Bill Cipher in a dream, but instead of being scared, she tries to understand his motives. Another could be a time - travel plot where Mabel and Bill interact in a different era. Maybe Mabel has to team up with Bill to fix a rift in the space - time continuum that he accidentally created.
A really interesting plot could be that Bill Cipher manages to enter the real world in a weakened state. Mabel stumbles upon him and, instead of turning him in, she decides to help him regain his strength because she believes there is good in him. As she helps him, she discovers that Bill has a tragic backstory that led him to become the chaos - causing entity he is. This makes Mabel question the nature of good and evil. Along the way, they face many challenges together, and Mabel's relationship with her friends and family is put to the test as she tries to keep Bill's presence a secret.
A plot could be that Human Bill Cipher is actually an undercover agent sent to protect Mabel from a greater threat in Gravity Falls. He has to hide his true identity while getting closer to Mabel. As they spend time together, Mabel starts to suspect that there's more to him than meets the eye.
A fanfiction might involve a love triangle between Human Bill Cipher, Mabel, and Dipper. Human Bill Cipher, with his manipulative ways, tries to win Mabel's love. Mabel is flattered by his attention but is also conflicted because of her strong bond with Dipper. The story could explore themes of jealousy, loyalty, and the power of true friendship as Dipper tries to protect Mabel from Bill's schemes.
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.
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 idea could be Bill Cipher getting involved in a lemon - themed mystery. Maybe there are disappearing lemon groves in Gravity Falls and Bill is suspected, but it turns out to be a mislead and there's a strange lemon - loving creature causing the chaos. Another could be a love story where a character has a lemon - scented charm that attracts Bill in an unexpected way, leading to a wild adventure filled with Bill's usual mind - bending antics.
One possible fanfiction could be where Bill Cipher tries to deceive Mabel in a different way than in the show. Maybe he appears to her in a dream, offering her the world's greatest collection of sweaters in exchange for a small favor that's secretly a big deal. But Mabel, being clever, starts to suspect his motives and tries to outwit him using her unique charm and creativity.
In 'bill cipher x mabel fanfiction', the plot device of the 'deal' is often used. Bill is known for making deals, and he might make one with Mabel. This could lead to all sorts of consequences and moral dilemmas for Mabel. Another common plot device is the 'alternate reality'. The fanfiction could take place in an alternate reality where Bill and Mabel have different relationships or roles. For example, they could be partners in crime in a world where chaos is the norm, or Mabel could be the only one who can see Bill and has to keep it a secret from everyone else.
A 'bill cipher x mabel fanfiction' could explore a really strange and interesting relationship. Bill Cipher is this super - chaotic and powerful entity, while Mabel is full of charm and innocence. In fanfiction, it might show Bill trying to manipulate Mabel in his devious plans, or perhaps Mabel finding a way to outwit Bill in some unexpected way. It could also delve into how their different natures interact, like Bill's lack of morals against Mabel's strong sense of right and wrong.
One idea could be that Bill Cipher enters the Ladybug universe and tries to disrupt the balance of good and evil. Ladybug and Cat Noir have to figure out his strange powers and motives. Maybe Bill starts by causing chaos in Paris, like making the Eiffel Tower come alive in a menacing way.
One idea could be that as Bill turns human, he has to deal with human emotions like love and empathy for the first time. He might struggle to understand why people cry or laugh, which could lead to some comical and also poignant moments.