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We're In This Together by Electricneonbat
Fandoms: Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023)
15 Dec 2025
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Falling into bed with your ex is never the right choice, especially when you haven't seen each other in three-hundred years. Bonnibel can't seem to help herself, and Marceline has no intention in controlling her urges.
Relationships are hard, doing things right is harder. Trying to fix what's broken can seem impossible when you can't keep your hands off each other, or when your partner expects the world of you.
Rewriting the entire series to have Marceline and Bubblegum's relationship intentional from the start, complete with comic books, lore books, video games, and spinoff shows. Starts shortly after S1E12: Evicted! Planning on playing with some pretty dark themes. Thanks for the read!
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Beasts in Heat by AllDirtNoGrass
Fandoms: Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023)
14 Dec 2025
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Early in her relationship with Finn, Huntress decides to tell him about going into heat and needs his help getting through it. Is it more than an excuse for smut? We'll see!
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After hurting his leg Finn starts getting dreams that try to tell him something he didn't know about himself.
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FinnFinity by robinrunaway
Fandoms: Adventure Time (Cartoon 2010), Infinity Train (Cartoon)
13 Dec 2025
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25 year old Finn must grapple with his past and rocky relationships and find a way to heal himself after accidentally stepping onto the infinity train.
Inspired by episodes such as “Dungeon Train” and “Temple of Mars” in Adventure time and my love for the highly underappreciated show Infinity Train I wanted to connect these worlds. The train does a good job at delving deep into a person's strengths and flaws. Every good character has dimensions. They are made up of complicated experiences, emotions, and contradicting viewpoints. The train throws everything it can against the wall hoping something sticks. I thought Finn would fit perfectly into this scenario as it is well suited for anthology and breaking down characters, such as with a hero/martyr complex, to build them back up again. Train style therapy!
As the story progresses I will bring in/reference other characters from each franchise as well as OC's. I don't have a lot of experience with writing lately so be patient with my upload schedule. I'm very excited to see where this story goes. -
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Many years ago, Finn helped a powerful witch who in return gave him a special boon that would go on to make him even more irresistible to the women of Ooo than ever before.
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An online rivalry seeps into real life. Finn Mertens isn’t a professional gamer, not on paper atleast, but he knows he’s better than most at this. The name of the game is “Adventure Time: Enchiridion War”. It’s one he’s played for years, yet somehow suddenly the illustrious veteran finds himself being outplayed by a mysterious newcomer.
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The human's journey (like the hero's journey yk?) by smth_unoriginal
Fandoms: Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023)
10 Dec 2025
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Idk man it's my first fic and I can't think of a name I was tryna be clever cuz the chapters are gonna follow the hero's journey plot guide and I have a really bad migraine so just humor me and read the stupid stuff I upload please.
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After witnessing a magical abduction late one night Huntress Wizard asks Finn and Bronwyn to help her get to the bottom of the mystery.
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Fern’s body is weird. And that makes Finn all sorts of curious as to what his grass copy can do…
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through the endless night by coralvines
Fandoms: Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023)
06 Dec 2025
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After being poisoned, Finn hallucinates, and dreams, and remembers.
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21-year-old Finn Mertens had it made as a suburban Californian young adult; a mother and father that loved him, he graduated college, his trusty dog, Jake, and his online videogame buddy Fionna, but before he could join the Us Marines, Finn is whisked away to a magical world called the land of Ooo that has no humans, is filled with monsters, talking animals, aliens, demons, and other non-humans, and it is in dire need of a champion. Can one human bring peace to Ooo, despite being the only human in the world?
(A 'What if" scenario where Finn never arrived to Ooo and didn't meet Jake and his parents)
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Lovestruck by Mazie_Daisy
Fandoms: Adventure Time (Cartoon 2010), Adventure Time: Fionna and Cake (Cartoon 2023)
06 Dec 2025
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Finn meets a mysterious girl and wants to know more about her.
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Marceline hace enojar a Bonnibel, lo cual no es nada novedoso. El problema es que Jake no se encuentra está vez para ayudarla con consejos amorosos.
Tendrá que conformarse con su adorable Finn. -
Adventure Tale by Kaboom91
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game), Adventure Time (Cartoon 2010)
05 Dec 2025
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After countless runs, something goes wrong, and now humans and monsters alike have been pulled into a strange new land with its own rules and its own dangers. Come Along With Me for the crossover nobody asked for, its ADVENTURE TALE!"
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- Part 1 of Adventure Tale Collection
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This is an idea I had about Simon petrikov in adventure time ever since Fionna and Cake that I REALLY wanted to express. So, I made this and leaving the possibility to make future chapters explaining this fusion or continuing it. This does take place after Fionna and Cake though. Hope you enjoy!
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Retrospection - An Adventure Friends Origin by COBER
Fandoms: The Ghost and Molly McGee (Cartoon), Invader Zim, The Marvelous Misadventures of Flapjack, Rick and Morty, Adventure Time (Cartoon 2010)
05 Dec 2025
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Five would-be strangers converge in Brighton in order to prevent the end of their world, but between being way out of their depth, their conflicts amongst each other, and their friends and families falling further into danger and despair, this adventure may be their most difficult yet.
Join Molly McGee, the unhinged self-proclaimed leader, Flapjack, the naive time-displaced adventurer, Dib Membrane, inventor and conspiracy theorist, Morty Smith, an aloof pest who's seen it all, and Finn, wielder of the demon blade and the only one who actually knows what he's doing, in their battle to figure out how the hell they're supposed to function as a team.Series
- Part 5 of The Adventure Friends
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BMO wasn’t sure why Finn and Jake were so eager to do some ‘Spring Cleaning’, especially since BMO cleaned themselves regularly, but there was nothing else to do on a boring, rainy day. Maybe they’d at least find some lost treasure.
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Finn sets out to find the Ice King's missing daughter, the Ice Princess.
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Finn the Human was living out his life in Ooo at his best, friends, family and even love in the romantic way aren't missing and he's managed to find more of his kind out there, many of whom begin to move to Ooo to meet him, including his dear birth mother...
But Finn isn't the one who'd live out this life from now on, rather the real original one is reclaiming what's his. And along the way he'll have to find out the price to pay for a hero's life as a conspiracy begins to arise in Ooo.
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- Part 1 of A Tale of Two Knights
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Marceline and Bonnibel are in a happy relationship. Everything is going well in their life. Which never lasts.