Angel of darkness ( fallen angel reader x sans)

your family are angels living on earth but you were different , you had dark wings and were a disgrace to the family so you were left alone for years until you find Mt Ebott

A Mermaid Tail (Papyrus x mermaid reader)

(Sorry for the pun in the title 😂) you were no ordinary girl, even though you seemed it most of the time, if you were to get water on yourself you would transform into... a Mermaid!

Muffet X Reader

Hi, this is my first fanfiction. I'm doing this for a competition with @troxyist so :P. So basically a Muffet x Reader Fluff. Well have fun :3

Goodnight, Kiddo... (Adopted by Sans! Reader Fanfic)

You are an orphan, abandoned by your parents at birth. You've lived between countless foster families and a dreaded girl's home for as long as you can remember, because nobody chose to adopt you. Now, you are fifteen years old, and you decide to run away. Monsters have been living on the surface come four years now...

Undertale! Grillby x (Half)Monster! Reader

You were a teen adopted by the skeleton bros, you personally hung out with Sans more then Papyrus cause if his training. Most times you both went to the ruins but, Sans wanted to take you to Grillby's. That's when you meet Grillby and the reason why you your flames increase is unknown. You are a human/fire monster

HybridTale

Artemis, a powerful human-monster hybrid, has the ability to absorb power from human and Monster souls. Alas, being half monster during the War of Humans and Monsters, her very existence is frowned upon by the human royals. When she and her mother are backed into a corner, what will happen to the child? An Undertale A...

To think I once hated you... (Sans x Author!Reader)

Everyone's on the surface. Frisk brought back Asriel. Everything was grand, except their monster family started ignoring them. At the beggining they just thought it off, until their birthday when everyone gave Asriel presents instead of them. Asriel kept on bulling them, so they did what they first thought of... they...

Eyes of Soul

Looks like another human has fallen down. What a scaredy cat they are. Frisk was so much more braver than them. Too bad Frisk took themselves out of the picture. At least this one is interesting, being able to see the souls of the dead that is. I wonder how she'll affect the timelines....? Heh heh. I guess only time...

My Knight In Shining Bones (Sans x Reader)

What instead of having a son, Toriel and Asgore had a daughter? A daughter who never died? A daughter named (y/n). Monsters have been locked in the underground for many years now, and their only hope is to collect seven human souls to break the barrier. With six souls in their collection, they're so close to breakin...

Kitty, You're Safe *Sans X Abused Neko Reader*

When a neko falls into the Underground, what does everyone do? They, of course, question her. But she holds a secret from her friends, and she plans on never telling them, afraid she will shatter her dream with the idea of... him.

Real pacifist (undertale reader insert)

Undergoing heavy editing for grammar and fluidity, since writers' block is halting me from continuing. (The references to TMNT are because of somewhat scrapped plans for a sequel crossover, will see where I go with it once I've finished this) THIS IS AN AU. You and Frisk fall into the underground after playing the gam...

MCSM/Undertale: A New Adventure

When Jesse and the gang finish their adventure with DanTDM, Stampycat, and Stacyplays, and finish off CasseRose, they finally enter the portal hall again, just to find themselves testing another portal. Will Jesse and the gang finally return home with Olivia and Axel, or will they find themselves in another crazy real...

When Dimensions Collide

When a power source of a machine called the Dimension Machine, which keeps all dimensions separate, is stolen, every world in the multiverse starts to slowly merge into one. Now, it is up to a group of heroes of other worlds to save the day. Although none of them know each other well, it is now their duty to retrieve...

Virtual-An Undertale Fanfiction-Book 1

Today, we follow Frisk's life as she finds an odd gray rectangle, with some different buttons on it. She soon founds out that this odd invention has an amazing number of squares with pictures and words. When she presses one of the buttons, she suddenly finds herself being pulled to the screen in a flash of white... C...

UnderTale AU Sans X Reader

Read to find out ;)

Dueltale! Resurgence of the Mythic Demons

Sealed away by the Numeron Code, monsters have lived underground for ages. One fateful day, a blank card leads a young human up into the mountains and down into the depths of darkness. With only the cards and fate guiding them, the human walks a path to destiny. What lies ahead in the depths of Mt. Ebott? What fate do...

From The Depths of The Ocean Oceantale X Reader

The year is 18XX You are Lady (L/N) , tutor to a young girl named Frisk. What happens when you're on a ship with the young lass and a storm hits? Only time will tell....

Turn Me On [Mettaton X Reader]

COMPLETE These feelings were just a bug. A bug Alphys couldn't figure out. That's all that Mettaton knew, because after all, he was a robot and you were a human. He ran on batteries, and you ran on food. He had variables and you had hormones. The difference between the two of you could not have been larger.

Undertale: 221X

What happened to all the monsters after Frisk- their ambassador- passed away? This story takes place 198 years after the pacifist run in Undertale, following twin characters Syrus and Fhara story when they fall through the opening in MT. Ebott and find themselves landed in the underground- trapped with the rest of the...

A Different Timeline. . . (Undertale, Sans Love story)

"A-another Human?? This can't be..." "Frisk is supposed to be the Last Human to come through those Doors..." "I won't be able to take it if I have to go through this Hell two times worse..." "It's supposed to be Impossible... Through all the Resets... The timelines...Never has another human come.. And Never has Flowey...

Aftermath

Ok so basically, everyone seems to love these. This is the first time I have written one and I think its a SansxReader. You tell me. I won't be doing any oc's and already have a plot line (and plot chart, school really gets to you). Anyways, its going by the aftermath of undertale pacifrisk play through. And uh.... no...

UnderTale High School

Living with Toriel and her newly bound friend Flowey (yes the sadistic flower). Frisk currently goes to High School in the OverWorld. But when the her friends who she met in the UnderGround arrive. What would people think?

Care for Some Tea? (Muffet X Reader)

Come on, get caught in the Spider Dance, dearie~ This is my first ever "x Reader" type story. I'm just testing the waters, so don't expect something too great ^^; ANYWAY You never felt at ease around Muffet. There was always an eerie sense about her and her spider lair. But lately...That sensation has been fading. She...

In The Spotlight! Mettaton x Reader!

Your best friend is an aspiring celebrity, who happens to hate Mettaton. But you both travel to his show to gain popularity. You loved Mettaton and his work, but you really didn't want to be on stage. But when an unexpected event happens, what will you do when you are face-to-face with the spotlight? (currently worki...

Undyne x Male Reader

[OLD] Fall in love with the one, the only, UNDYNE! Yes indeed, guaranteed with this book you get a girlfriend, then a wife, then an adventure! Read now for the low low price of only $0.00! You heard me! $0.00! Hurry up and read now!

Undyne x Female reader

Welp! Here you go ladies! Surprisingly people are actually enjoying the girlxgirl books. Well some. So heres an Undyne x female reader book! Your name is (Y/N) (L/N). You fell down Ebott when you we're 10 years old. Ever since then Toriel took care of you until you we're old enough to get your own house. You don't rem...

Against All Odds

Undyne and Papyrus have always been an unshakable duo. Nothing can get between them... or so they thought. But all the best relationships have to go through trials sometime and they're definitely no different. ROMANTIC UNDYRUS. Implied Soriel. This story will be in 2 parts. It's also filled with delicious suspense a...

Undyne's Daughter

Sorry for the ones thinking this is a daughter scenario but sadly it isn't.But who's saying you can't change the name and other stuff in your head?Now to the summary: Undyne was just making sure nothing was wrong in the waterfall.After half an hour or so she noticed that the mad dummy was threatening someone with it's...