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 Marines, Finn is whisked away to a magical world called the land of Ooo that is in dire need of a champion... (Will contain Lemons) (FinnxHarem)

Everyone knows to stay away from Petrikovs Manor; between the strange noises, sightings, and legends of people going missing, it's a place to be avoided. However, on Halloween, teens dare one another to get close to the manor, and despite his objections, Finn and his group are determined to blow the dare wide open. (Warning, Lemons ahead!)

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.

Redemption and recovery may come at a steep cost, but the Rehearsal is over and it's time for Bonnibel and Marceline to decide if the price is one they're willing to pay.

Instead of Finn and Jake, it's Fionna and Cake who are faced with clown nurses eager to nurse them back to health! Except... This time, these nurses are hot bimbos; how is Fionna going to fare when they decide to play with her? Smut! One Shot!

After a freak magic ceremony, Ice King's fanfiction comes to life and everything spills into Ooo! What hijinks and shenanigans will ensue?

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

Kind of a Prequel Revival to my old story of Beautiful Accident, its just Finn and Jungle Princess having various adventures with each other and being all Romantic during the process.

Solo es un viendo universos no hay mucha ciencia.

Finn and Wolfwood have left the mortal plain. But their families have yet to tell and share their pain. Find out what both sides have to say when the eleven years apart are finally reveal. *Yes this is the sequel to Scattered Journey your year of waiting is over*

A street urchin with no name or family dies only to wake up in a familiar world as a one of the cornerstones of the elements. Yet this familiar world has many unfamiliar twists and turns that will test her to no end (SI-OC)

Join Finn, Jake, and Ice Princess Rachel as they embark on their many mathematical adventures as they strive to keep Ooo safe as righteous heroes.

Quelle est la mesure d'un vrai héros ? Est-ce sa force ? Son courage ? Son sens du sacrifice ? Finn l'humain cherche la réponse à cette question, rempli de regret et de rage le héros de Ooo s'apprête à rencontrer son destin, il affrontera des ennemis redoutables, encaissera les pires épreuves, serra tourmenter par le chaos de ses sentiments, mais ce chemin ferra de lui un héros.

browhyn deseaba ser una aventurera más que nada en el mundo al igual que su abuelo jacke y el hermano adoptivo de su abuelo la paresona que más admiraba en el mudo de hoo finn el humano.

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...

Finn dyes Fern's hair. Or, my preview of an Adventure Time highschool esque AU. (Flame Princess and Jake only mentioned)

"Te fuiste por un largo tiempo" Esas palabras quedaron grabadas en Finn cuando su madre se las dijo, y unas que hicieron pensar detenidamente a Minerva mientras observaba a su hijo.

Finn and Finnsword chat and watch a sunrise (Post CAWM) (Tagged Finnsword as Fern because there isn't a tag for him)

Being King of the Vampires is tedious work and being the son of the wealthiest business man in Ooo is boring. So what else is a bored King to do but terrorise his father's rival? Leading his troupe into battle one night he catches the eye of a girl he's never seen before. Little does he realise that she is the one girl he should stay away from. Marshall LeexOC. AU. LEMONS

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.

Resulta que la felicidad no es tan fácil de encontrar.

Zyro is a young dragon who becomes the adopted brother of Finn and Jake. Together, these unlikely heroes will embark on many adventures in The Land of Ooo while fighting off evil, meeting new people, and discovering secrets of the past.

An Adventure Time adjacent show, we follow the tales of a group of high schoolers who through wackiness and loredom lead their lives in a new land while dealing with enemies beyond Pendleton's paygrade. Think the OG show but brought down to "normal".

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…

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?