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.
Well, in some fanfictions, Finn's hair is cut off and it becomes a sentient being. It goes on its own journey while Finn has to deal with the loss of this part of himself that he's always had. There could also be a story where an enemy targets Finn's hair specifically because they believe it holds great power. Or perhaps Finn's hair is used in a magical ritual by some other character, and Finn has to figure out how to reverse the effects.
A common type of story might involve Finn's hair being a source of a special power that he doesn't fully understand. For instance, his hair could be the only thing that can save the Land of Ooo from a new, strange threat. Some fanfictions might also play with the idea that Finn's hair has a connection to an ancient prophecy. The different ways his hair is depicted in these stories can add a whole new layer of creativity to the Adventure Time universe.
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 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 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.
There is a fanfiction where Finn accidentally stumbles upon a magical harem. In this story, he has to learn to balance his normal adventuring life with the new dynamics of the harem. It shows his growth as a character as he faces different challenges and emotions related to the harem members. It's quite interesting as it also incorporates elements from the original Adventure Time world, like the use of magic and strange creatures.
In Adventure Time Finn Parents Fanfiction, a frequently seen concept is that Finn's mother was a princess from a forgotten kingdom. She might have fallen in love with Finn's father, a commoner. But due to political unrest or some dark magic, they had to separate and leave Finn. Also, the idea that Finn's parents were time - travelers is quite popular. They could have been sent back in time and got stuck, leaving Finn behind as they tried to fix the time - rifts they created.
One popular story could be about Finn and Bubblegum going on a quest to save the Candy Kingdom from a new and mysterious threat. In this fanfiction, Finn's bravery and Bubblegum's intelligence are put to the test as they face various challenges along the way.
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.
Writers can create unique characters by making Finn's hair a sort of magical conduit. There could be a character who is a hair - stylist in the Land of Ooo, but with a magical touch. They can transform Finn's hair into different forms, each form having a different power or effect. This character could also have a backstory related to how they discovered their unique ability with Finn's hair. Another idea is to create a character who is envious of Finn's hair and tries to steal its powers, leading to all sorts of conflicts and adventures in the story.
My favorite pairing in Adventure Time Finn love triangle fanfiction is Finn with Flame Princess. Their relationship is full of passion and energy. The storylines where Finn has to prove his love to Flame Princess against all odds are really engaging. For example, when he has to face challenges in the Fire Kingdom to win her heart back after a misunderstanding.
One great 'Adventure Time Finn Hair' fanfic is 'Finn's Hair: A Mysterious Power'. It delves into the idea that Finn's hair has some hidden magical abilities that he's not yet fully aware of. The story has some really cool action scenes where Finn has to use his hair in creative ways to defeat enemies. It also has some nice character development for Finn as he discovers more about this unique aspect of himself.