A theme that often shows up is self - discovery through heartbreak. Finn might be so used to being a certain way or having certain expectations in his relationships. When those are shattered, he has to reevaluate himself. This can be a really interesting theme as it shows his growth. Also, the theme of loneliness can be prominent. After a heartbreak, Finn may feel all alone in the Land of Ooo, which is a sad but very engaging theme in many 'Adventure Time Finn Heartbroken Fanfiction' stories.
Betrayal is also a theme that can be found in this type of fanfiction. For example, if a character Finn trusts deeply turns out to have been lying to him or using him, it would break his heart. And then there's the theme of growing up and the pain that comes with it. Finn realizing that the world isn't as simple as he once thought and losing some of his innocence can be a source of heartbreak in these stories. These themes help to explore different aspects of Finn's character and his relationships in the Adventure Time universe.
Well, you might also try some fanfiction communities dedicated to Adventure Time. They could have some great stories about Finn being heartbroken. Sometimes, on Tumblr as well, fans share their own fanfictions or reblog interesting ones. You just need to search for the right tags like 'Adventure Time Finn Heartbroken Fanfiction'.
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.
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.
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.