One possible theme could be exploring the darker side of sibling relationships. Maybe it delves into how misunderstandings or power imbalances within a family can lead to such a disturbing situation. However, this is a rather unorthodox and potentially disturbing concept for a fanfiction.
Another theme might be the aftermath of such abuse. How Dipper copes with it, and how it affects their relationship with other characters in the fanfiction universe. But again, this is a very heavy and rather negative topic for a fan - created work.
No. Such fanfiction contains themes that are not family - friendly or positive. It can have a negative impact on the mental state of those who read it, especially if they are vulnerable or have had experiences related to abuse.
Perhaps in the fanfiction, Mabel could be influenced by some outside force or character that makes her act out against Dipper. This outside influence could make her say or do things that are out of character for her, like physically pushing Dipper in a fit of anger over something small, which would hurt him both physically and emotionally. Or she might spread a false rumor about Dipper in the Gravity Falls community they live in, which would lead to Dipper being ostracized and deeply hurt.
One common theme could be the exploration of a different kind of relationship between them, perhaps in an alternate universe where the normal sibling boundaries are a bit more blurred. Another theme might be the idea of a first kiss and the emotions that come with it.
One common theme is sibling adventures. Since Dipper and Mabel are siblings, a lot of fanfictions explore their relationship further while they go on different adventures in Gravity Falls. Another theme is mystery - solving. It's in line with the overall tone of the show, so fanfic writers often create new mysteries for the twins to solve.
Adventure themes are great. For example, they could go on a new mystery - solving adventure in Gravity Falls that the show didn't cover. They could encounter new strange creatures and solve puzzles together.
Popular themes include Dipper's pursuit of knowledge about the supernatural in Gravity Falls and Mabel's knack for making friends. Fanfictions might focus on how they combine their skills to get out of tricky situations. Another theme is the contrast between Dipper's more serious nature and Mabel's more light - hearted one. Some fanfictions play with this difference, showing how they complement each other in different adventures, whether it's facing a new monster or uncovering a conspiracy in the town.
One common theme could be role - reversal in their personalities. For example, Dipper might be more carefree and Mabel more cautious. Another theme could be exploring a different kind of relationship dynamic between them, like a more romantic - friendship hybrid.
A common theme is the protection they offer to one another. Dipper is always ready to protect Mabel from any danger that might lurk in Gravity Falls, and vice versa. This is often shown in fanfiction through various dangerous scenarios. And there are also fanfictions that explore the idea of how their different personalities, Dipper's more inquisitive and Mabel's more fun - loving, complement each other and strengthen their love. It's like they bring out the best in each other. Additionally, the theme of forgiveness is also there. When they have arguments or misunderstandings, which are normal for siblings, their love always helps them forgive each other quickly.
One common theme could be the theme of responsibility. If we consider the 'pregnancy' as a symbol, it could be about Dipper and Mabel learning to be more responsible for their actions or for something new in their lives, like taking care of a new pet or a new magical item in Gravity Falls.
One interesting Dipper and Mabel fanfiction could be about their further adventures in Gravity Falls after the events of the show. Maybe they discover a new mystery that involves an ancient creature from the forest. Another could be a story where they swap personalities for a day and how they deal with it. And there might be a fanfic that focuses on their relationship with other characters in a different way, like how they interact with the gnomes in a more complex plot.