Undertaleaus Stories

1.2K Stories

Our Pen by R3myR3ad3r
#1
Our Penby R3myR3ad3r
You're the Ink of your multiverse, and you don't even know it. Well, until you meet the Ink of another, along with Error. -NOTES- I made the cover! This obviously isn't...
Completed
Mama Nootmare (A fanfic with the bad sanses) by Ravenpoint
#2
Mama Nootmare (A fanfic with the b...by Ancient Failure
A fanfic/story of Nightmare and children bad guys! All of the bad guys are children excluding Nightmare and Error. This is a story of Nightmare being a parent. I am ter...
An Interesting Reincarnation (Reader reborn as...) by AliceParadoxi
#3
An Interesting Reincarnation (Read...by AliceParadoxi
You wake up, finding yourself standing in a desolate grassy field, only the green grass had withered and died, leaving behind a dry, lifeless expanse. Above, the sky was...
Nightmare's little brother. (REMAKE!) // JUSTMarsLOL by JUSTMarsLOL
#4
Nightmare's little brother. (REMAK...by JUST Mars!
~ Dream was born 21 years after Nightmare was. Right after he was born, he was already titled as the 'Guardian of Positivity'. Quite too young for a child like him. But...
Out-Code Spawns in a different Multiverse (SCP Foundation x Alphatale) by adamabyss12
#5
Out-Code Spawns in a different Mul...by adamabyss12
There are 2 different multiverses that are next to each other. One that is made simply of Code and Data, being made by the Game Creators, used for entertainment by the P...
Threads of Balance  by Moonlight_Malaysia
#6
Threads of Balance by Moonlight_Malaysia
A young person wakes up in the endless Void, transported into the glitching, destructive body of Error Sans. With the power to erase entire timelines at a flick of his s...
Completed
Reincarnated as Dream with Differences by Xalatea_Zennia
#7
Reincarnated as Dream with Differe...by Zennia
(Discontinued) A random teenager dies, and no they don't get hit by the Isekai truck unfortunately. The 'driver' couldn't make it on time. This teenager wasn't really r...
My Anomaly (An Error Sans X Reader)  by nightmare597
#8
My Anomaly (An Error Sans X Reader...by Nightmare
When your sibling Chara goes missing you fear the worst, but life takes a surprising turn for the better when they release the monsters trapped underground. Living this...
Killed it! {Reincarnated as A Killer Varient} by coolkidindahood
#9
Killed it! {Reincarnated as A Kill...by DaCoolest
⪼Beaten up and betrayed, {Name} dies an unfair death because of their best friend. Having their life and their brothers whisked away in a flash. ≫They find that they inh...
In this world, it is Consume...or Be Starved and Consumed (Axetale Aliza x OC) by adamabyss12
#10
In this world, it is Consume...or...by adamabyss12
The Underground...once the home of the race of Monsters, now having turned into an infectious wasteland of starving-infected beasts, with the monsters horribly twisted a...
Completed
~ Sans AUs x Reader OneShots ~ by AvocadoDragon
#11
~ Sans AUs x Reader OneShots ~by 🥑🐉
(Book gets better with each OneShot-) Requests are (Closed ❌), Thank you! I've started this when I was in 8th grade, because I've seen a few x Reader books and was like...
He Came to Stay (Blue x Bad Guys) by EmberAshTheFaithful
#12
He Came to Stay (Blue x Bad Guys)by EmberAshTheFaithful
Living on a steady diet of caffeine, sugar, and sheer will is not a healthy lifestyle. But how else can you keep up with teammates that need no sleep, no food, and who e...
Naturetale : reborn as lavender  by KarmaAkabane425
#13
Naturetale : reborn as lavender by Karma Akabane
(As far as I know, no one has made a story about naturetale like this so..and the only reason why I writing one like this is because of fatal error part 5? Or part 4, go...
Horror's of the Multiverse (Being Rewritten) by UnderTaleHyperFixed
#14
Horror's of the Multiverse (Being...by UnderTaleHyperFixed
Someone dies and is Reborn as Sans. Not just any normal Sans like they assume as first, but a HORROR Sans. As if dealing with Gaster when they were young wasn't enough...
New Purpose (US!Papyrus x Female!Reader) by OreoDaSkeleton
#15
New Purpose (US!Papyrus x Female!R...by ~Oreo~
Y/N, meets a new coworker that changes her life forever. A monster, doing his best to make a living after moving out of the underground. Sans is this ecstatic, cheerful...
Reincarnated as Lust Sans by UniversalMotcha
#16
Reincarnated as Lust Sansby Corrupt_Blossoms
Hello! I haven't seen anybody make this so I decided to be the first! And no I don't own this universe nor Undertale -w- I may not be consistent or even post for months...
Perspective by Fandom_Glitch
#17
Perspectiveby Off-Track
Try seeing things from another point of view... Fresh wants to feed off of a long lasting host, he wants to exist longer. How will he do this and how will he survive? On...
Completed
As ready as I can be since I'm dust...wait hold the phone! Pregnant!?  by KarmaAkabane425
#18
As ready as I can be since I'm dus...by Karma Akabane
(You know how it goes, someone from our world Ends up dead and becomes dust sans..but somehow pregangt, different things, different personalities etc
Darkness Is Nicer Than It Seems (Nightmare Sans x Reader) by Lollipopswirl99
#19
Darkness Is Nicer Than It Seems (N...by Lollipopswirl99
(Y/N) had a regular life. A normal job, home, everything. Sure she had her own problems like insomnia, nightmares, and no friends but that wasn't anything to special. T...
Jaune Error by CCKGISKMKGSRAD
#20
Jaune Errorby Core Jaune
Jaune Arc this man always wanted to be a hero like his ancestors but fate decided to mock the blond knight Jaune saved Cardin Winchester from the Ursa Major but Cardin d...
Completed