One interesting plot could be that the Jungle Princess and Finn go on a quest to find a magical artifact hidden deep in the jungle. Along the way, they face various challenges like strange creatures and tricky puzzles.
Obviously, Finn and the Jungle Princess are the main characters. Finn, a brave and adventurous boy, and the Jungle Princess, who has her own set of skills and knowledge about the jungle environment.
In this fanfiction, an exciting plot could be Si being reborn as Finn but with some of his own memories intact. He then tries to find a way to merge his old self with Finn's heroic identity. Along the way, he might meet Jake and they could go on adventures together. Si could also have to deal with the moral dilemmas that Finn sometimes faces, like whether to help a villain who seems to have a good side.
One possibility could be a story where Finn and the Lizard Princess go on a quest together. Maybe they have to find a magical item that is hidden deep in the Candy Kingdom. Finn's bravery and the Lizard Princess's unique abilities would surely make for an interesting adventure.
There could be a fanfiction where Finn and Flame Princess have to team up with their old enemies turned allies to fight against a powerful dark force. This would involve a lot of character development and exploration of their complex relationships. For example, Flame Princess might have to control her temper in order to work effectively with others, and Finn would have to use his wits more than his sword at times.
One interesting fanfiction could be about Finn and the Fire Princess going on a quest to save the Candy Kingdom from a new, mysterious threat. They might face challenges that test their relationship and individual strengths.
In Adventure Time, the Jungle Princess is a rather mysterious character. She lives in the jungle, as her name suggests. She has her own set of rules and ways of life. Her interactions with other characters, like Finn and Jake, are always full of surprises. For example, she might offer them help in one episode but be a bit of a trickster in another. She adds a lot of depth and variety to the Adventure Time world.
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 possible plot could be Evil Finn trying to take over the Candy Kingdom. He might use his dark powers to turn the sweet inhabitants into his minions. Another plot could involve Evil Finn forming an alliance with other villains from the Adventure Time universe, like the Ice King in his more menacing moments. He could then plan to rule over all of Ooo together.
I'm not sure who the 'best' is exactly, but there are many talented writers out there. Some popular ones might be those who have been writing in the Adventure Time fanfiction community for a long time and have a large following. They usually have a good understanding of the characters of Finn and the Fire Princess and can create engaging stories.
The main characters are Finn, a brave and adventurous human boy, and the Water Princess. Finn is known for his heroics and his sword - fighting skills. The Water Princess has control over water and is from the Water Kingdom.