There's a fanfic called 'Finn and Marceline's Musical Journey'. In this story, music becomes the medium through which they connect on a deeper level. It has some really heart - warming scenes where they share their feelings through song, and it's quite a unique take on their relationship.
I really like 'The Bond Between Finn and Marceline'. This fanfic delves into their pasts and how those experiences have shaped their current relationship. It shows how Finn's innocence and Marceline's world - weariness play off each other, creating a really interesting dynamic.
One great Finn x Marceline fanfic is 'Adventure in the Night'. It beautifully explores their relationship in a post - apocalyptic setting. The author does an amazing job of portraying Finn's growth and how he and Marceline interact in this new world.
I really like 'Finn and Marceline's Night Out'. In this fanfic, they have a sort of double - date situation with Jake and Lady Rainicorn which leads to some really funny and heartwarming moments. It shows a different side of their relationship in a more comical setting.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfics, and you can easily search for Finn x Marceline ones. Just use the search bar and type in the relevant tags.
One great Finn x Marshall Lee fanfic is 'Adventures in the Night Realm'. It beautifully weaves their personalities together. The story takes them on an exciting journey through a magical forest at night. Another one could be 'Friendship and More' which starts with their initial encounters and gradually builds a deeper connection between them.
I really like 'Finn and Marceline's Unlikely Alliance'. It shows a unique take on their relationship where they start off as reluctant partners but end up having a strong bond. There's also 'Marceline's Song for Finn' which is a more emotional fanfiction that focuses on Marceline's feelings towards Finn through her music.
Adventure is a major theme too. Since they are in the world of Adventure Time, they go on quests and have escapades. This theme allows for a lot of action and exploration in the fanfics. And there's also the theme of trust. As their relationship develops, they learn to trust each other more and more, which is a key part of their story.
One great Finn Marceline fanfic is 'The Adventure Beyond the Night'. It beautifully weaves their relationship, showing how Finn's courage and Marceline's mystery come together in a story full of adventure. Another one could be 'Finn and Marceline's Unusual Bond', which focuses on the development of their unique friendship and how it might turn into something more in a very heartwarming way. And 'Marceline's Influence on Finn' is also interesting, as it delves into how Marceline's presence affects Finn's growth and understanding of the world around him.
Well, a frequent theme is the contrast between their personalities. Finn's optimism and Marceline's more cynical nature create an interesting dynamic. Also, the theme of mystery is common. Marceline has a lot of secrets, and fanfics often revolve around Finn trying to uncover them. And of course, the theme of acceptance. How they accept each other's flaws and differences is a big part of many Finn Marceline fanfics.
You can find 'Marceline x Finn fanfiction' on websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including Adventure Time. Another good place is FanFiction.net, which has been around for a long time and has a decent amount of Adventure Time fanfictions.
Some Tumblr blogs are also dedicated to sharing and discussing Finn x Marceline fanfiction. You can search for relevant tags on Tumblr, like '#FinnxMarceline fanfic' and you might find some great recommendations or even some exclusive fan - made stories.
There's 'The Unlikely Friendship'. In this fanfic, it starts with Finn and Marceline being sort of at odds, but as the story progresses, they begin to understand each other better. It shows Finn's growth as he tries to see things from Marceline's perspective, and vice versa. It's a great read for those who like character - driven stories.