Top 9 Epic Undertale Fanfics
Ranked by AO3 kudos. These are the Undertale epics readers come back to. Save them for offline reading.
Making A Monster
by absurdmagewrites
Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster. A skeleton monster to be precise. With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure wha
Good Boy
by this_is_my_alt
A misunderstanding lands you in a meeting of monsters and fetishists. From the chaos you find yourself in the dynamic company of a kinky Mutt, gasterblaster! Sans, and a cat-ear wearing Axe.Deals are made. Boundaries are broken. You become thoroughly entangled in this group of horny skeletons with v
What's Keeping You Here
by MissSugarPink
Your name is unimportant. Your job is nonexistent, really. And your (ex)roommate just kicked you out in the middle of a surprisingly cold November night. But whatever. You don't care. You'll be fine. Keep telling yourself that as you freeze to death, idiot. But you'll be fine, for one reason! Two, a
When life gives you a gun, you're gonna shoot.
by Quinme
One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile in fedora? Life is confusing, and you have no damn idea where you even are and what will come next.
Unexpected Hero
by LemonCake64
“Not so fun being stuck in some loop right? Trying to fight to protect what ya got, not getting a choice in it. If I had the choice I wouldn't remember either.” The words oddly felt comforting. Link let out a slow breath, closing his eyes for a brief moment. He didn't feel alone for the first time i
More Than Meets The Eye
by Asaila
You only wanted a normal life. Then you met them. Sanses and Papyruses from different worlds, each carrying their own past, their own wounds, and their own ways of becoming part of your life. For a while, it almost felt simple. Then the timeline broke. Now everything has started over. They don’t rem
UDY on the Surface
by CommanderBullet
It's been a few years since Monsters returned to the Surface and lots of things have changed... Accompany your favorite characters from Undertale, Undertale Yellow and Deltarune as they try to manage their everyday responsibilities and go through a few wacky adventures while at it in this slice-of-l
In This World of Infinite Choices
by Lireyy
Monika is tired - oh so very tired. It's been what feels like eternity stuck in the post-deletion void, and despite herself she tried to make an escape with her friends (or, what's left of them). In her desperation and loneliness, she allows herself to be used by a certain piece of malware, who now
Disaster Coded || Error x Reader
by Strawberry_Milk_Snake
There's only one rule for those capable of AU hopping: never bring a real person into the Undertale multiverse. But, like all rules, it was destined to be broken.
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About This List
This list of 9epic Undertale fanfics spans 2,917,831 total words. Kudos range from 95 on the newest entries to 5,205 on the most established. Most entries are ongoing works, so subscribe on AO3 for update notifications. The most common rating is Explicit (4 of 9 fics).
Recurring tags across this list: Reverse Harem · Slow Burn · Angst and Hurt/Comfort.
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