The Flowers Bloom -Classic!Sans x...by AlexLoveForever
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1K5011You and your sibling, Frisk, have been living in a forest near the city for about four years now. Your daily routine has been unwavering since you moved here. Each day...
You are filled with amusement by Smiley 122
122Ok ok hear me out I know this might be cringey but just hear me out. A human named Maryellen falls into the underground instead of Frisk, see how different the story pla...
Determination (Discontinued)by froppygirl17437511
37511follow frisk on there adventurous in the underground. This is a pacifist route.
There are no fan ships in this and im trying my best to base this off the actual characte...
Completed
Wait am I in Undertale?!by FlurryLight1401
1401I don't do Y/n stories so character insert it is! Katie dies by an unknown force and gets stuck in the hallway where every fandom has a door that leads to their world Ka...
Undertale: The Reunionby RosieGeee39573
39573This is in the same universe as "Baby Sega" everyone is returning to the Capital of the underground from wherever they were for the three year anniversary of f...
The Trioby M1ntym1st42134
42134A Undertale Fanfiction that was written as a School Project. Cross-posted on Ao3.
Image is a Craiyon AI generated image of sans.
Three completely normal people get drop...
Super Paper Undertoad (Mr.LXDiment...by SilverStarWarrior3.4K23631
3.4K23631Hush now, little ones...
I have a story for you...
A story about men and ancients...
A human wakes in Princess Peach's garden only to be found by Timpani. His name is Mr...
Completed
Another nerd? Sans x Aware M!Undyneby Snowy <32201
2201A few months after dating alphys, undyne went to the lab to see sans. Undyne knew that sans was odd after all the timelines but this was something new. Soon after finall...
Hotcattaleby Jusauria1001
1001This story is an AU from Undertale [by Toby fox]. In this AU Sans works with Dr. W. Gaster on a project that fails. Because of the explosion Sans magic starts to change...
The Fallby Valorus Prime4292
4292Valoren "Valor" Dawson is on the run after escaping M.E.C.H.'s facility and being experimented while tortured for information on the Autobots. while on the run...
KFC(An Undertale fanfiction) {Disc...by RJ5.4K1145
5.4K1145What do you think would happen if Kris,Chara,and Frisk were ro face the dangers and challenges of Deltarune and Undertale together? Well think no more! Cause this story...
the fire girl and the snow girlby coolcattwo cat101
101a story about grillby daughter a fire monster meeting nice cream guy's daughter and they fell in love
The frisk timeline (undertale)by dudethatexists2517
2517A action story of frisk exploring all time and space
Flowey x Ocby ....711
711Hey guys please be Nice I try of make a good story be supportive and vote Comment and stay hopeful and determined!!
Chara x himiko (I did this out of...by haley hoshimia201
201(Sup so I guess I'll put a description lol)
In a world of kill or be killed could a killer really fall in love? Or will she end up killing the one who loves her?
Himiko...
Undertale- After the Endby missmable2.9K5112
2.9K5112An Undertale fanfic that is about what happens after the monsters escape the underground. And just a funny and dramatic telling of how humans integrated Monsters into th...