In some fanfictions, they might talk about their pasts. Finn could share his adventures as a human in a magical world, and the lady could talk about her own experiences. This could lead to a new understanding and friendship between them. For example, they might discover that they both had to overcome great difficulties in their lives. Finn had to grow up without parents in a strange land, and the lady might have faced discrimination or other hardships. Through their conversation, they find common ground and support each other.
One interesting storyline could be Finn and the lady having a deep conversation about the nature of good and evil in the Land of Ooo. Maybe they discuss how to handle the various villains they've encountered.
Another possible storyline is that they talk about their dreams for the future of Ooo. They could be thinking about ways to make the land a better place. Finn might have ideas about bringing more peace among the different kingdoms, and the lady could contribute her own thoughts on how to improve the environment or the relationships between the various creatures in Ooo.
Finn is the adventurous and somewhat naive human. His perspective is always interesting as he views the magical world of Ooo through the eyes of an outsider. The lady, whoever she is, usually has her own set of values and goals. If it's Flame Princess, for example, she has her power and her own kingdom to think about. Their conversations in the fanfiction are shaped by these aspects of their characters.
One interesting fanfiction could be about Finn and Lady Rainicorn going on a magical quest together. They might encounter strange creatures and have to use their unique skills to overcome obstacles. Finn's bravery and Lady Rainicorn's flying ability would be really useful in such a story.
One interesting storyline could be Huntress Wizard taking Finn on a magical quest through the Land of Ooo that he's never been on before. They could encounter strange new creatures and Finn has to rely on Huntress Wizard's knowledge of magic to survive.
Perhaps Finn's death is an accident. He could be exploring an uncharted area of Ooo and stumble upon a dangerous trap or ancient magic that he doesn't understand. His death shocks everyone in Ooo, and his friends start to question the safety of their continued adventures. This could lead to a whole new set of adventures for his friends as they try to come to terms with his death and make Ooo a safer place in his memory.
One popular storyline could be Finn's hair having magical properties. For example, his hair might grow uncontrollably and start to have a life of its own, leading him on an adventure to find a way to control it. Another could be a story where Finn's hair is the key to unlocking a hidden realm. Writers might also explore a plot where Finn's hair changes color based on his emotions, which then affects his adventures in strange ways.
One possible storyline could be Finn exploring the world as Fionna. He might have to deal with the different social dynamics in the female - dominated version of the Adventure Time world. Maybe he'll struggle to fit in at first but then find his own place among the characters like Cake and Prince Gumball.
One interesting theme is Finn's search for identity. Since he's a human in a strange land full of magical beings, he often questions who he is and where he belongs. Another theme could be his relationships, like his brotherly bond with Jake or his complex feelings towards Princess Bubblegum.
Another possible theme is the exploration of different cultures within the Adventure Time universe. Lady Rainicorn comes from a different species, and fanfictions can delve into how her culture and Finn's human - like culture interact and influence each other.
One interesting fanfiction could be about Finn and Bear going on a quest to find a magical artifact that can heal all wounds in the Land of Ooo. They might face various challenges like strange creatures and tricky puzzles along the way.
Well, in Adventure Time Finn harem fanfiction, often the different personalities of the characters in Finn's 'harem' are really fun to explore. For example, how Finn would interact with a more serious character compared to a goofy one. It can also show how Finn might grow and change through these different relationships, which adds depth to his character.