What if one simple difference caused so many changes in Ooo it will make your head spin, Jake being late to the initial meeting between and Phoebe to introduce her to Finn and Don John happened to be in the area. Nuff said this won't be a simple one change thing... a lot changes and Bubblegum gets dragged into this and much much more... find out more in ACFP

My first multi-chaptered Adventure Time fanfiction, enjoy. (I'll have a better summary in the future)

Jake and Bmo go to a zoo

When finn feels like he has lost his sole purpose after the series finale he is revealed the truth and makes a decision which will not only effect his legacy but all of OOO

"I had my croak dream." Lemongrab 2 whispered, and from that moment things were never the same between the lemongrabs.

Marceline no tenía idea de todo lo que su presencia desataría en el castillo, pero solía creer en un cambio y por fin estaba sucediendo.

Marceline moves into her new college dorm only to find out that her room mate is her ex best friend. And her local barista. And her fake girlfriend. And her… fiancé? Marceline's not even sure where to start.

The 100th new story on my side of things, had help with Atomsk the Pirate King to help this story to be... plenty of tropes, drama, sexy fun starting near the end of chapter 2... Emerald and many more have one hell of an Isekai adventure to Ooo... but with some twists... please enjoy the time hopping adventures of the new Glob of time Emerald who saves Ooo ages from a great evil.

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.)

Shortly before the Mushroom War, people tried to live normally. Elise was an ordinary teenager who had the (bad) luck to meet Hunson Abadeer, the high school fuckboy.

Cuando la estructura de todo el multiverso se ve en grave peligro por una sola persona, es deber de un grupo específico de personas arreglar el desastre, y la legendaria heroína Fionna es la líder; sin embargo ese es sólo el inicio de esta montaña rusa de secretos, engaños, y revelaciones.

Realistic/human AU. Finn is a freshman in high school, being raised by his adoptive brother, after the death of their parents. He's an average teenager, with raging hormones, and a posse of female friends.

When Finn and his friends are being judged for past crimes, they're sent to a Kingdom that specialize in punishment… and pleasure. Would they overcome the trials or be broken? Harem as usual. Will have light and dark lemons. Some OC's are owned by TME. This is a co-op.

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.

The Sequel of Fire in the heart(Rewrite). it's the Human and Vampire Twins birthdays and Finn and Phoebe and Marceline are gonna teach them about being a hero and others stuff.

A soft tone met his ears, it wasn't obscured by the heavy accent of it being transmitted over radio waves, nor was it frizzed up by poor mic quality. A gentle breeze whisked around his face, it was warm, smelt of coffee, with the lightest twinges of mint. - Or: Finn gets cursed by a witch and lives a life he could never experience.

Marshall Lee can't stop teasing Fionna, and it drives her nuts! Nuts, as in, makes her want him so bad. Cute, funny start with a hot, burning ending. If you are not satisfied with this garbage, you get TWICE your trash back! As always, you're welcome, world. I know this is what you all really want. (SMUT)

It's Halloween, and all of Aaa is preparing for the biggest bash of the year in Candy Kingdom. Everyone except Fionna, who seems to always be a target for the trickster Vampire King this time of year. She had no intention of going. But she did go. And it was awful.

(Completed first arc... next arc will be on Atomsk side) what if instead of Marceline being able to absorb the Vampire King's essence back into her, the cloud surprised everyone and tried to attack her but Finn gets in the way and as a result... he gains the Vampire Kings powers and becomes a vampire himself... get ready for A New Vampire King. (Lemon warning(Finn X mass Harem)

Dos chicas completamente diferentes, unidas por su trabajo de cuidar a una autora famosa. Adaptación del libro de Andrea Tome

Falling in love is easy. Letting go is not. Immortality is great, until you realize it kills you in a different way. Is this something that can work, or do all things break with time? A collective story about how Fionna and Marshall Lee discover their feelings for each other. Rated: M for adult language and smutty goodness.

Sometimes, all Finn wants to do is try to help. All the time, Finn becomes collateral damage.

Based on my THOROUGH distaste for the abstinence curriculum and the horrible lack of sex ed in the public school system I give you... THE TALK... except GUMBALL is going to give it to you, and he manages to do a worse job than the government! Imagine that. Good thing MARSHALL is here to show us how it's really done, right kids? NO LEMON, so rated T for obvious discussion of sex.

(Co-op work, harem version, based off of Scott Pilgrim VS the world) What if Marceline and Bubblegum had a falling out of sorts thanks to a prank of Marceline's and shortly after she meets a new friend who would help her in many ways, enjoy what happens when the main OC (You know its Emerald by now people) fights 7 people for fragments and defends Marceline... enjoy.

I do not own Adventure Time or its characters