One idea could be a time - travel plot. Marceline accidentally sends herself and Princess Bubblegum back in time to when Ooo was first being formed. They have to work together to find a way back to their own time while also dealing with the primitive versions of their friends. Another could be a body - swap story. They wake up one day in each other's bodies and have to navigate each other's lives for a day, which leads to a lot of humorous and heartwarming moments as they understand each other better. A third plot could be a mystery where something strange is happening in the Candy Kingdom and Marceline teams up with Princess Bubblegum to solve it, and during the process, they discover hidden feelings for each other.
A great plot idea is a music - centered fanfiction. Marceline is a rocker, and Princess Bubblegum is a princess with her own unique taste in music. Maybe there's a music competition in Ooo, and they decide to form a band together. Along the way, they face challenges like finding the right sound, dealing with rival bands, and of course, their growing feelings for each other. Or perhaps a story where Marceline loses her memory and Princess Bubblegum has to help her regain it. As she does, they relive their past adventures and interactions, which makes Marceline see Princess Bubblegum in a new light and deepens their relationship.
One idea could be that the baby has unique powers that combine Princess Bubblegum's scientific knowledge and Marceline's vampiric abilities. For example, the baby might be able to control both candy elements and shadows. Another plot could involve the two moms trying to raise the baby in a world that doesn't fully accept their relationship, so they have to face challenges together to protect their family.
Well, one of the popular themes is love. Their relationship has romantic undertones in the show, and in fanfiction, it's often explored more deeply. There's also the theme of power. Princess Bubblegum with her scientific and ruling power, and Marceline with her vampire powers can have stories where they deal with power imbalances or combine their powers for a common good. And of course, there's the theme of redemption. If there were past wrongs in their relationship, fanfictions might explore how they can redeem themselves in each other's eyes.
In such fanfiction, the lemon part usually implies a more adult - themed or steamy relationship exploration. However, it's important to note that this often goes beyond the boundaries of the original children - friendly Adventure Time series. Some writers might use it as a way to add a new dimension to their relationship, perhaps showing how they overcome challenges not just as friends but as lovers in a more intense setting.
The appeal might be the forbidden - like nature of their relationship in the original show. Fans are drawn to the idea of seeing what could happen if they had a more intimate relationship. It's like exploring uncharted territory.
There's a fanfic called 'Candy and Rock'. In this story, Princess Bubblegum and Marceline go on an adventure together. It shows how their different personalities, with Bubblegum's scientific and organized side and Marceline's carefree and edgy side, complement each other. And then there's 'The Moonlit Meeting', which focuses on a more emotional side of their relationship, especially during a full moon in the Land of Ooo.
One common theme is the exploration of their contrasting personalities. Marceline is often seen as the cool, edgy vampire while Princess Bubblegum is the more scientific and orderly ruler. Their differences create interesting dynamics in the fanfic.
One plot could be about them going on an adventure together to a mysterious land. They have to overcome various obstacles and in the process, they grow closer and discover new things about each other.
Well, a good plot could be about a competition. There's a grand competition announced in the Candy Kingdom, and both Prince Gumball and Princess Bubblegum enter it. They start off as rivals, each determined to win. But as the competition progresses, they realize that they can achieve more by working together. So they form an alliance and end up not only winning the competition but also strengthening their bond as friends or more.
One highly regarded story is 'The Longest Night'. It beautifully explores their relationship with great character development. Another good one is 'A Shared Melody' which delves deep into their shared history and how it affects their love for each other.
One great Marceline x Bubblegum fanfiction is 'The Bond Beyond Time'. It delves deep into their relationship, exploring how their past experiences shape their connection in the present. The story has a great balance of adventure and emotional moments between the two characters.