Friendship and relationships are important too. Female Finn's interactions with other characters from the show, like Jake, Princess Bubblegum, and Marceline, are explored in different ways. Sometimes it's about strengthening existing friendships, and other times it's about forming new and unexpected bonds.
One common theme is self - discovery. Since Finn is such a dynamic character in the show, in female Finn fanfiction, she often goes on a journey to figure out who she is in a different gender - swapped context.
Often, the theme of adaptation comes up. A female Finn has to adapt to the same world that the male Finn knew, but with the added factor of being a different gender. This can lead to her having to prove herself more in some cases. Also, the theme of sisterhood or female friendships might be explored more in these fanfics. She could form new bonds with female characters in the Adventure Time universe that weren't as prominent in the original with male Finn.
One common theme is self - discovery. Finn, as a dragon, has to figure out who he is now and how to fit into the world. Another theme is power and responsibility. With his dragon powers, he has new abilities but also new responsibilities. For example, in many fanfictions, he has to protect the weak or save the Land of Ooo from threats.
One common theme is friendship. Finn and Marceline have a unique friendship that often gets explored in fanfiction. They come from different backgrounds, Finn being a human hero and Marceline a vampire, and how they bridge those differences in their friendship is a popular theme. Another is adventure. Since they live in the Land of Ooo, they often go on wild adventures together in these stories.
The theme of redemption can also be found. If Finn is somehow influenced by the demons in a negative way, he tries to find a way to redeem himself. There are also themes related to the unknown and exploration. The demon world is often a new and mysterious place for Finn to explore, which brings in the theme of discovery.
Another theme is friendship. They rely on each other during their adventures. Finn's bravery and Roselinen's intelligence complement each other. They support one another through difficult situations, whether it's facing a powerful enemy or solving a complex puzzle.
One common theme is self - discovery. Finn often goes through a process of learning more about himself as he experiences love. Another theme is friendship. Since Finn has so many friends in Adventure Time, his relationships with them are often intertwined with his romantic interests.
The theme of sacrifice is also quite prevalent. Finn may have to sacrifice something, like his own desires or his time with friends, for the sake of his romantic relationship. In many fanfictions, he has to make tough choices between his love and other aspects of his life in Ooo.
One common theme is the exploration of relationships. Finn, being the central character, has to navigate through multiple relationships with different characters in the harem. Another theme is character growth. As Finn deals with the harem, he often grows as a person, learning about different personalities and how to interact with them.
One common theme is innocence. Baby Finn is depicted as pure and untainted by the more complex aspects of the Adventure Time world. For example, in many stories, he approaches dangerous situations without really understanding the full danger.
One common theme is friendship. Finn is all about his friends in the show, and in fanfics, his relationships with Jake, Princess Bubblegum, and others are often explored further. Another theme is self - discovery. Finn is constantly growing and learning about himself, and fanfics often take this aspect and expand on it. For example, in some fanfics, he discovers new powers or abilities that make him question who he really is.