Concept: Finn Mertens is a peculiar individual. Ripped out of his timeline and plunged into a land named OOO, Mertens constantly travels with one goal in mind: Return back to his timeline and stop himself from igniting the fabled Great-Mushroom War.

What happens a normal kid dies and finds themselves reincarnated in their favorite show as the brother of the future queen of vampires herself. A lot of stuff, some good some bad. But one thing is for sure, a lot will change. (SI-OC)

Ooo is a place where even the most unlikely of relationships can bloom by pure chance, and when it comes to the Ice King nothing is entirely certain what could happen. Huntress Wizard’s first mistake was giving him an inch.

Bonnibel's NOT a groupie. [Rated M for smut]. AU.

College AU, Marceline begrudgingly decides to go to her local Community College. The second she walks in she's entranced by a gorgeous stranger. The two couldn't be more different, but that isn't an issue for Marceline. It may however be an issue for her boyfriend Ash…

The great question endures: who would win in a fight between Nietzsche's Übermensch and Mandroid? The answer is...Werewolf Prince. It's always Werewolf Prince! (Genderbent Werewolf Queen SI-OC for the new Fionna and Cake show)

Being a princess may seem amazing, but Aurora Starlee hates it. She can never leave the castle, everyday is almost the same, and she only has her mother for company. When she is accidentally transported to another dimension, she now has the adventure she's been hoping for.

What if Bubblegum decided to make a study on many creatures of Ooo and hires many people to help her with the studies and many of them happen to not only go into details of said creatures lives... but their mating habits as well... look inside to find out more on BCS. (Lemon filled from start to finish.) (Ash Death in first chapter) (Male OC's will be used with female humanoids.)

Like the title says, what if the people of Ooo started to make certain... videos after Marceline starts this new trend of sorts to spice things up with PB... no real action persay, just raw smut between AT characters, Canon and non-canon characters will be used, read at your own risk, suggest people for Marceline and others to have fun with and Atomsk and I will try to fit them in.

Treachery swirls around the King of Ooo, as the violent factions acting against his empire grow their power in secret. His brother's family becomes increasingly fractured, as Kim Kil Wan pursues his vengeance against the man he once called 'uncle'. Meanwhile, Minerva the Finn-mom and her team strive to repair the Ark's damaged control system before the massive colony falls on Ooo.

The land of OOO is a free place for everyone to roam around. Dogs, penguins, humans, wizards, vampires and princesses... It's also one filled with extraordinary cataclysms... This is true especially for it's two residents, Marceline Abadeer and Bonninbel Bubblegum who found themselves with a peculair child on their hands...

Valentine's day isn't the best for everyone. Could this be the best Valentine's day of Bonnibel's life... or the worst? This will be a slow-burning story. Most AT main and secondary characters will be in this story. 18 , suggestive themes, probably smut down the road, and fights. High school AU. Marceline x Bonnibel Bubblegum. Bubbline. This is my first story, please be kind. (:

This is a story, a story about One True Hero Of Ooo, Finn the human. This story takes place 5 years after the comet with Finn grown up but a nearly broken man. His friends have secrets that seem suspicious. These friends will become Finn's enemy...or is it the other way around? (And just to let you know there will be violence, swearing, and alot of smut.) :3 THIS IS BEING REWITTEN

Following the events of GOLB and the Gum War, Finn must play out the hand the universe has delt him. Amidst the rubble and devastation Finn will realize that everyone has secrets to hide and ghosts from the past come back to haunt your present, even if that past isn't yours. Are the people Finn has known all his life slowly becoming his enemies…. or is it the other way around?

Simon gets the power of the crown, but he doesn't lose his sanity or Betty. The war happens and Simon and Betty find Marceline and raise her as their own. The new family face many difficult challenges. A story in which a hero will rise and help defeat a great evil in the distant future. A different Ooo will rise and take shape. Also there will be many crossovers.

After losing her bond mate for more than a few hundred years, Huntress Wizard went back to learning Dark Magic as she hopes to reunite with Finn. Luckily, She reunites with a certain Vampire Queen and the duo embark on a interesting journey. Co-op by Twilight Master Emerald and I. No flames, only constructive criticism.

Breakfast Princess gets a little revenge on Marceline and Lumpy Space Princess after Princess Day.

The war of Ooo was prevented, and the mighty Golb was stopped. But the adventure isn't over yet. It's just beginning. Watch as The former Last human faces many challenges and Himself. Co-written by AdventureKing2017 New Cover Image

After the events of "Frost&Fire", Finn takes the crown and becomes the new Ice Prince before freezing himself to sleep. 4 years later, he wakes up only to find out that a dark evil is trying to take over Ooo. Will have some bits of "Shadow of Mordor" and "Shadow of War" . Also will have a harem for Finn and a harem for an OC that belongs to my great friend and Co-writer, TME.

Betty and Marceline friendship Au. What if Betty never went completely solo in trying to save Simon?

After choosing life, Finn makes amends with Flame Princess.

Marshall aparece en el departamento de bonnie en medio de una tormenta literal y metafórica buscando la calma que solo ella podría darle en ese momento Au basado en los personajes de hora de aventura, donde son adultos jóvenes en un mundo normal Me encanta el fiolee pero ese fic me salió natural con esta pareja

After the events of Mama Said, Finn and Jake not only lost their job but also their home thanks to the King of Ooo. Luckily, they were able to get new employment from an ally. Co-op by TME and I. NO FLAMES PLEASE! Only constructive criticism.

Finn and Jake discovered a portal outside of their treehouse. They both decide to go on an adventure through the portal, but will they be able to return home? What strange world will they end up in? Find out and see!

prismo discovered an alternative ooo where Finn and Phoebe lives are swap