Perhaps Finn is framed for releasing a dangerous magical entity in Ooo. The evidence seems overwhelming, but Finn knows he's innocent. As he tries to find out who really did it, he discovers that the framing is part of a larger plot by an ancient evil that wants to create chaos in Ooo. Finn has to race against time to not only clear his name but also stop this greater threat. He'll meet old friends and foes along the way, and his friendship with Jake will be tested as they face many challenges together.
One plot idea could be that Finn is framed for stealing the Ice King's crown. He then has to go on a journey to find the real thief to clear his name. He teams up with Jake, and they start by investigating the last place the crown was seen.
One idea could be Marceline and Finn teaming up to explore a new and mysterious part of the Land of Ooo. They could encounter a powerful and ancient magic that they have to figure out how to control. Another plot could be Finn trying to help Marceline reconnect with a long - lost friend from her past. Maybe there's a feud between this friend and Marceline that Finn has to mediate.
A possible plot could be that there's a magical artifact deep in the Adventure Time Canyon that Finn is tasked with retrieving. However, the Canyon is guarded by a powerful being. Finn has to prove himself worthy to the being in order to gain access to the artifact. Along the way, he learns about the history of the Canyon and its significance in the Adventure Time world.
One possible plot idea could be Finn using his god - like powers to save Ooo from a new and powerful dark force. Maybe he has to sacrifice something precious in the process, like his friendship with Jake for a short time to fully unlock his powers.
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 start by having a bit of a misunderstanding. Finn might accidentally break a water - related tradition in the Water Princess's kingdom. This causes some tension between them at first. But then, they discover a common enemy that is threatening both the Land of Ooo and the Water Kingdom. So they have to put aside their differences and team up. They could go on a journey through different elemental regions, like a fire region where they have to use the Water Princess's powers cleverly to survive.
One idea could be Finn and Huntress Wizard going on a quest to find a rare magical artifact that can save Ooo from a new threat. Another could be a story where they get lost in an uncharted part of the Land of Ooo and have to rely on each other's skills to survive. Maybe a plot where Huntress Wizard tries to teach Finn some advanced magic techniques, but Finn has trouble grasping them at first.
One idea could be exploring how the other characters like Jake deal with Finn's death. Maybe Jake would go into a deep depression at first, as they were such close friends. He might then try to find a way to bring Finn back, leading to all sorts of magical and dangerous adventures.
One idea could be Finn going on different adventures with each member of the harem separately, and then they all come together to face a big threat in the Land of Ooo. For example, he might go on a treasure hunt with one, a quest to save a magical creature with another.
One plot idea could be Finn and Huntress Wizard going on a quest to find a magical artifact that was lost in the Enchiridion. They face various challenges along the way, like battling strange creatures and solving riddles.
One plot idea could be Finn and Huntress Wizard going on a quest to save a magical forest. They encounter various strange creatures along the way and have to use their combined skills to overcome obstacles. Another could be a story where they get trapped in an alternate dimension and have to find their way back home while dealing with the unique challenges of that dimension.