There's also 'The Melody of Their Hearts'. This fanfic focuses on Marceline writing a song for Princess Bubblegum. It delves into how their different personalities, Marceline's edginess and Princess Bubblegum's orderliness, come together in a harmonious relationship through the power of music. It's a very creative take on their relationship.
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.
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.
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.
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.
Fanfiction.net is another place to look. It has been around for a long time and has a wide variety of fan-written stories. Just type in 'Marceline and Bubblegum' in the search field, and it will show you relevant fanfics. However, the quality can vary, so you might need to do some sifting through the results.
There's also 'The Unspoken Connection'. This fanfic delves deep into their past and how their friendship/relationship has evolved over time. It has some really touching moments that fans of the two characters will love. It also includes some great descriptions of the Adventure Time world that add to the overall atmosphere.
One popular fanfic is 'Winter's Warmth'. It beautifully portrays the relationship between Marceline and Bubblegum during a cold winter in the Land of Ooo. The story focuses on how they support each other through difficult times and has some really sweet moments of them sharing their feelings. Another great one is 'Midnight Melodies' which delves into Marceline's past and how Bubblegum helps her come to terms with it. It has a lot of emotional depth and great character development.
The Ice King could be an antagonist. He might be jealous of their relationship and the new baby. He could try to kidnap the baby to have someone to care for him. Another potential antagonist could be some of the more traditional Candy People who don't approve of Marceline being with Princess Bubblegum and having a baby together. They might try to separate the family.
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.
Sure. There are fanfictions that explore their backstories and how they became friends. Maybe Marceline teaching Princess Bubblegum about the vampire world in a platonic way, or Princess Bubblegum showing Marceline some new scientific discovery in the Candy Kingdom. It's all about building on their unique bond without any sexual undertones.