Some fanfics might have a theme of transformation. The female character could start off as an ordinary person but then be changed by her encounters with Bill Cipher. This could be a physical, mental, or even spiritual transformation. Also, the theme of redemption might be present. Even though Bill is typically seen as evil, the female character could try to bring out some good in him or find a way to redeem his actions, although this would be a very challenging task considering his nature.
Well, a very common theme would be the power struggle. Bill Cipher is extremely powerful, and the human girl is, well, just a human. So, the fanfic might explore how she copes with his power and tries to assert herself. Also, themes of mystery and the unknown are likely, as Bill Cipher is full of secrets. And there could be a theme of transformation, where either the girl changes Bill Cipher or is changed herself by their encounter.
Well, often there's the theme of isolation. As Bill Cipher's daughter, she may be shunned by others who fear her connection to him. Friendship can also be a theme. She might seek out true friends who accept her for herself. And power is a big one. Whether she inherits some of her father's power or has her own unique abilities, dealing with power and how to use it morally or immorally is a common theme.
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 common theme is the clash of different power systems. Bill Cipher has his otherworldly and chaotic powers, while the Naruto characters have chakra - based abilities. So, the fanfictions often revolve around how these two power systems interact.
The theme of friendship, in a very twisted way, can also be found. In some fanfictions, the OC and Bill form an unlikely bond that challenges the traditional view of good and evil. Additionally, the theme of power is prevalent. Whether it's the OC trying to gain power over Bill or Bill trying to use the OC's power for his own ends, it's a key element in many of these fanfictions. This often leads to intense power struggles and interesting plot twists.
One common theme is the power struggle. Since Bill Cipher is a powerful and malevolent being, the OC often has to deal with his attempts to overpower them. Another theme is mystery, as the OC might be trying to figure out Bill Cipher's true motives.
One possible theme could be power imbalance. Since Bill Cipher is often depicted as a very powerful entity, an abused fanfic might focus on how this power is misused against others.
Another theme is the power of the human spirit. Despite Bill Cipher being an extremely powerful and malevolent entity, the male reader doesn't give up. He uses his own inner strength, whether it's his love for others, his determination, or his sense of justice, to fight against Bill. Even when faced with seemingly impossible odds, the male reader keeps trying to overcome Bill Cipher's threats and schemes.
Well, a frequent plot element is the corruption of other characters. Bill Cipher might return and start to influence the minds of the good guys, turning them to his side or making them do his bidding. There's also the aspect of mystery. His return might be shrouded in mystery, with characters having to figure out how he came back and what his true intentions are. And, of course, there's often a battle or struggle to stop him again, which can involve new and creative powers and strategies.
Well, a common theme is her power play. Since Bill Cipher is known for his great power, a female Bill could have her own unique way of using and flaunting it. It could be about her trying to take over Gravity Falls in a more subtle or devious manner. And then there's the theme of redemption. Maybe in some fanfics, she decides to turn away from her evil ways and help the town instead. It's an interesting take on the character.