Well, an interesting plot might be that there is a rift in the fabric of Ooo that is causing chaos. Finn and Jake have to journey through different dimensions within Ooo to find the source of this rift. Along the way, they meet alternate versions of their friends and enemies. This could lead to some really fun character interactions and also show different interpretations of the already well - known Adventure Time world.
A great plot for this fanfiction could be delving into the backstory of some of the minor characters. For instance, the Ice King. We could see his life before he became the Ice King and how he coped with the transformation. Or perhaps a story where Marceline teams up with Finn and Jake to fight a common enemy that threatens all of Ooo. This enemy could be a powerful, ancient being that was once sealed away but has now been released.
One idea could be exploring Finn and Jake's further adventures in the Land of Ooo. Maybe they discover a new, hidden kingdom filled with strange creatures and magical artifacts. Another plot could revolve around Princess Bubblegum creating a new type of candy that has unexpected side effects on the inhabitants of the Candy Kingdom.
One idea could be Shoko discovers a new, hidden realm in the Land of Ooo. She teams up with Finn and Jake to explore it and uncovers ancient secrets that could change the whole world of Adventure Time.
One idea could be exploring Finn's family background more deeply. Maybe he discovers a long - lost relative who has a unique power. Another could be about Jake's pups and how they grow up in the Land of Ooo, facing different challenges as a family. Or perhaps a story about Princess Bubblegum's family tree and how it affects her rule in the Candy Kingdom.
Well, a plot could revolve around the return of some old foes in a new form in the future. For instance, the Lich could come back as a more insidious threat that infects the minds of the future inhabitants of Ooo. Also, we could explore the idea of Finn's sword having new powers or a different significance in the future. Maybe it's the key to unlocking a long - forgotten dimension that holds the secrets to saving Ooo from a new impending doom.
One idea could be a new student arriving at Adventure Time Academy who has a mysterious power that no one has seen before. This new character could disrupt the existing social dynamics among Finn, Jake, and their friends.
Maybe Marceline the Vampire Queen teams up with a Dark - type Pokémon in a fanfiction. Since she has a somewhat dark and mysterious personality, it would be interesting to see how she interacts with a Pokémon that shares those traits. For example, she could form a bond with a Umbreon and they could go on adventures together.
One idea could be Dark Finn's struggle with his new identity. He might have to face his former friends who are now scared of him. Another could be his journey to find a way to reverse his dark state, leading him through strange and dangerous lands.
Well, they could go on a quest to find a rare ingredient for a special cake that Jake wants to make. Along the way, they encounter various obstacles like a swamp full of gooey monsters or a forest with trees that can move. Also, a plot could be centered around Jake losing his stretching ability and Cake having to find a way to get it back for him. This would involve them visiting different parts of Ooo and asking for help from their friends.
Another plot could involve Jake Jr trying to prove herself to Finn and the other heroes. She could take on a difficult quest, like finding a rare ingredient to cure a sickness that has befallen the Candy Kingdom. This would show her determination and growth as a character. It could also involve her making new friends along the way who help her in unexpected ways.
One idea could be exploring their adventures in a new, uncharted part of the Land of Ooo. Maybe they find a magical artifact that has the power to change the past, which could bring back Simon's old self for a while. Another could be them getting stuck in a time - loop where they keep repeating a particular day and have to figure out how to break free.
One idea could be that the Ice Princess decides to explore the human world for the first time. She might encounter strange things like cars and skyscrapers and have to figure out how to adapt. Another could be a story where she teams up with Finn and Jake to save the Ice Kingdom from a new, mysterious threat that is melting all the ice. Maybe she also discovers a long - lost power within herself during this adventure.