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 a fanfiction, Mabel might be the one to find a way to free Bill Cipher from his dimension under certain conditions. She could think that she can change him and make him good. However, as Bill Cipher enters the real world, he starts causing chaos in Gravity Falls, and Mabel realizes she has made a huge mistake. She then has to team up with Dipper and the rest of the gang to stop him before it's too late.
One way a fanfiction could go is that Bill Cipher is actually trapped in a form that only Mabel can see. He needs her help to break free, but Mabel is hesitant. She doesn't trust him at all. Bill Cipher then tries to convince her by showing her glimpses of things she desires, like the future with all her friends happy and her having amazing adventures. But Mabel has to decide if she can really trust Bill Cipher or if it's all just a trick.
Fanfiction about Bill Cipher as a human in Gravity Falls can be really interesting. It allows for new interpretations of his character. For example, a human Bill could have a backstory that makes his actions in the show more understandable. Maybe he had a difficult childhood that led him to his devious ways in the Gravity Falls universe.
Fanfiction about Bill Cipher and Dipper in Gravity Falls often explores their complex relationship. Some fanfics might focus on the power struggle between them, as Bill is a powerful and malevolent entity while Dipper is a curious and intelligent boy. It can also delve into how their interactions shape the events in the Gravity Falls universe.
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 common theme is redemption. Since Bill is often seen as a villain in the show, some fanfictions explore the idea of him becoming a better person as a human. Another theme is love. He could fall in love with a character in the Gravity Falls world, which would completely change his motives.
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.
The theme of temptation often appears. Bill is known for tempting people with power or knowledge, and Dipper may be lured by Bill's offers in fanfiction. This can lead to internal struggles for Dipper as he decides whether to give in or resist. Also, the theme of friendship in an unlikely context can be explored, where despite their differences, there are moments of connection between them.
Mabel could escape by using her grappling hook. She always has it with her and could use it to swing away from Bill when he's not looking.
One common theme is the exploration of the 'opposites attract' concept. Bill is this powerful, otherworldly and often malevolent being, while Mabel is a sweet, innocent and positive girl. Their interactions based on these contrasting natures are often explored. Another theme is the idea of the unexpected. Their relationship is not something that one would expect in the normal Gravity Falls storyline, so fics often play with this element of surprise.
They're popular because it's an unexpected pairing. Mabel is a very positive and kind - hearted character, while Bill is a chaotic and often malevolent force. The contrast between them makes for interesting stories. Fans like to explore how Mabel's goodness could potentially influence Bill or how she would deal with his dangerous nature.