#1
Undertale a New Monster is Hereby Why_Is_It_Spicy
Y/N was just your normal every day monster in the underground, well. That's what he thought at least before meeting the human. Join Y/N in his adventure with the human i...
#2
The Alien Hero of the Underground...by ShortMannZ
This story follows the storyline of if Ben 10 travelled the Underground with Frisk.
Feel free to notify me of any errors in the story.
I hope you enjoy.
(I do not take c...
#3
Runawayby DevinGaming321
Finally. They made it to the surface. But after an attack on the monster king, Undyne reveals a hidden secret that destroys the group. Can they bring themselves back tog...
Completed
#4
Undertale Yellow: Genocide's after...by I burned the water
Long ago, two races ruled over Earth. Humans and Monsters.
One day, a war broke out between the two.
In the end, the humans are victorious.
They sealed the monsters with...
Completed
#5
Big Sister Undyneby Moonstone_Ccino
Underfell is a dark world with the major rule of kill or be killed. Even though children are suppose to be secluded from this rule, that doesn't stop monsters from hurti...
#6
(Sans x Reader) When Two Souls Meetby Zana B Sparrows
Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over a...
Completed
#7
Mr. Erratumby SleepyPersonHere
Error can take it no longer. After centuries of Pain and suffering, Error no longer cares what happens to the people who caused him pain, and now wants to leave the plac...
#8
Undertale Reactby ----
Undertale is going to react.
This will not be entirely canon and will include aspects of what I believe (backstories, ect.)
I do not own the cover and I do not own any o...
Completed
#9
The Time Before (Undertale)by ANinnyMouse42
~o0o~ Book 1 of the "Better Times" trilogy ~o0o~
(Book two: "A Name to Remember")
(Book three: "No One is Happy with This")
There was a tim...
Completed
#10
Desert Sanctuary Guidebookby KarmaSpidr
Clover doesn't give up his soul because justice still needs to be delivered.
The Wild East, and later practically the entire Dunes, declares independence. They declare...
#11
Can I take you to Dinner? Mafi-fel...by MissHoll-E-Socks
"How rude, not even gonna ask for a name??" He teased. "Why are you here?" You glowered, raising the whisk. The skeleton scoffed: "Well, glad yo...
Completed
#12
Undertale AU Sibling Oneshotsby CrowBorn666
Yup! They're back! A thing I started back in my older account UndertaleKyannaKitty.
They're your siblings now!
Cute, edgy, as much angst as you want, sad-whatever!
Reque...
Completed
#13
Love or LOVE? 「Chara and Frisk x R...by Azzy
the player gets sucked into the game after refusing to do genocide =)
_________________________
Just how far is Frisk willing to go in order to let you leave?
How dire w...
Completed
#14
Undertale x male readerby Toad Yeager
So harem book of Charas and Frisks x male reader but real description is below this.
The only one of his person in all universes is part of Undertale with an OP powers b...
#15
What We Hope For (Sans X Reader) ✨...by Grace
Everyone has a happy ending. If you're not happy it's not the end . . . .
•°•°☆°•°•
Y/n (that being you) fell into the underground...
Completed
#16
"It's a Beautiful Day Outside...by Septiplyierfangirl
......"It's a beautiful night today. The stars are twinkling, the crickets are chirping...On nights like these, villains like you, should be burning in hell"...
Completed
#17
Undertale X Readerby Frei_111
You woke up on bed of golden flowers without having anything to remember. Going to an adventure where you met with many monsters to go home. Easy, right?
Not really, act...
Completed
#18
Unexpected Love | Sans x Readerby mal ✩ˎˊ˗
You climbed the famous Mt. Ebott to prove to a group of your friends that humans don't disappear when they go up the mountain. While walking around the peak, you trip ov...
Completed
#19
Voidheart [Female Chara x Male Rea...by Shybo
"You shall seal the blinding light
light that plagues Human and Monster dreams
You are the vessel
You are the Hollow Knight"
•Somewhat of a reboot of Someth...
#20
Royal Blueby Spilled-my-coffee
Sans knows a lot about secrets; he hides many.
But when old burdens emerge from the darkness, secrets, new and old, put his brother in danger; and what else can a good b...