One interesting Finn and Jake fanfiction could be about their adventures in a new, uncharted land within the Land of Ooo. Maybe they discover a tribe of magical creatures that they have to befriend to get a special item for Princess Bubblegum.
Adventure is a very common theme. Finn and Jake are known for their adventures in the original show, and fan fictions often continue this trend, sending them on new quests.
One great theme is their friendship adventures. Stories that focus on their new quests and how they support each other through different challenges are always interesting. Another theme could be how they grow together as characters over time.
Finn might initially go into denial. He could keep expecting Jake to just pop back up like he always does. Then he'd probably get angry, at himself or at whatever caused Jake's death. Eventually, he'd start to accept it and try to honor Jake's memory by being a better hero.
In this fanfiction scenario, Finn and Jake as vampires might have enhanced physical abilities. Finn could be even more skilled in combat with his vampire speed and strength. Jake, with his shape - shifting ability combined with vampiric powers, could turn into some really unique and powerful forms. They might also have to deal with the typical vampire problems like avoiding sunlight and craving blood, which could lead to some interesting moral dilemmas as they try to stay true to their heroic selves.
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Another interesting one is 'Jake's Family Ties'. It delves deeper into Jake's family, exploring his relationships with his extended family members. It's full of humor, just like the show, and also has some really cool magical elements related to Jake's shape - shifting abilities.
One interesting fanfiction could be about Finn and Jake going on a quest to a mysterious new land that wasn't explored in the show. Maybe they encounter a new type of magical creature that challenges their friendship and they have to work together to overcome it.
The main characters are clearly Finn and Jake from their own world, and Fionna and Cake from the alternate world. Finn is brave and adventurous, always ready for a fight. Jake is more laid - back but also very loyal. Fionna is a spunky girl with her own set of skills, much like Finn. And Cake, the talking cat, provides comic relief and is also very resourceful, just like Jake in many ways. They are all important as they interact and their stories intertwine in this fanfiction.
The plot might involve Finn and Jake being initially confused by the different gender - swapped versions of themselves in Fionna and Cake's world. Then they learn to work together to solve a mystery that is threatening both of their worlds. It could start with Finn and Jake following a strange portal that leads them to this new place with Fionna and Cake. As they interact, they find that their skills and personalities are both similar and different from their counterparts, which makes for an interesting dynamic.