Frisk (Undertale) FanFiction

Your Lives Are My Game [SHORTS]

Your Lives Are My Game [SHORTS]

F/F
F/M
M/M
Multi
G
Updated
11.04.2025
Fandom
僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga) Undertale (Video Game)
Characters
Midoriya Izuku, Midoriya Izuku/Yaoyorozu Momo, Midoriya Izuku/Everyone, Midoriya Inko, Yaoyorozu Momo, Chara (Undertale), Frisk (Undertale), Clover (Undertale Yellow - Master Sword), Original Undertale Character(s)
Tags
Self-Indulgent Midoriya Izuku-centric Midoriya Izuku Has a Harem Overpowered Midoriya Izuku Overpowered Yaoyorozu Momo Wish Fulfillment Pretty much entirely lmao Idea dump kinda Midoriya Izuku and Yaoyorozu Momo are a Power Couple
A series of (now canon-ambigious instead of canon) shorts related to the "Your Lives Are My Game" story. Decided to separate this from that since it must've been annoying seeing that story at the top of almost every Izuku pairing tag and then some. H...
UnderWatcher Part I

UnderWatcher Part I

F/F
F/M
Gen
M/M
Multi
Other
G
Updated
11.04.2025
Fandom
Undertale (Video Game)
Characters
Frisk (Undertale)
Tags
Alternate Universe POV Alternating Alternate Universe - Undertale Multiverse | UTMV (Undertale) Alternate Universe - UnderWatcher (Undertale) Undertale Alternate Universes Reader Is Not Frisk (Undertale) Reader Is Not Chara (Undertale) They/Them Pronouns for Frisk (Undertale) Adult Themes
This is the story of UnderWatcher, an Undertale AU created by me, WylohWist. In part I, you'll follow the story alongside the character and learn about this world, its characters, its history, and its future. (Please note that tags will be updated al...
It's Not Too Late (Male Reader Edition)

It's Not Too Late (Male Reader Edition)

F/F
M/M
G
Updated
11.04.2025
Fandom
Undertale (Video Game)
Characters
Reader, Chara (Undertale), Frisk (Undertale), Sans (Undertale)/Reader, Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), W. D. Gaster, Sans/You, Sans/Male Reader,
Tags
Slow Burn Friends to Lovers Humor PTSD lots of fluff male reader - Freeform And angst mentions of self harm Mentions of Suicide monster hate groups Reader is male You like kidnapping?
You haven't had an easy life. The mistakes you've made have carved literal scars into your mind and body. A precious life was lost because of you. But now you've moved to a new city, trying to leave all that behind you. You've got a promising new int...
Fŕįßk Jane đřēæmèr Potter

Fŕįßk Jane đřēæmèr Potter

Gen
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling Undertale (Video Game)
Characters
Original Characters, Harry Potter, Minerva McGonagall, Severus Snape, Ron Weasley, Hermione Granger, Ginny Weasley, Fred Weasley, George Weasley, Albus Dumbledore, Chara (Undertale), Frisk (Undertale),
Tags
Character Bashing Albus Dumbledore Bashing Manipulative Albus Dumbledore Female Frisk (Undertale) Harry Potter Has a Twin Harry Potter Has a Sibling Frisk doesn't like Dumbledore
Lily and James had three children their oldest Jake Potter, their hair, th middle child Harry Potter, the boy who lived and the youngest Frisk Jane Potter known to the Wizarding world as Jane Lily PotterThis story starts in Frisk's first year at hogw...
PLEASE

PLEASE

F/F
F/M
M/M
Other
G
Updated
11.04.2025
Fandom
Undertale (Video Game)
Characters
Reader, Frisk (Undertale), Sans (Undertale)/Reader, Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Asriel Dreemurr, Papyrus & Sans (Undertale), Toriel (Undertale), Mettaton (Undertale),
Tags
Alternate Universe - College/University Español | Spanish Soulmates First Love Love at First Sight Homosexuality Heterosexuality reader is a baddie sans is in love so bad tee hee
Dentro del subsuelo habían reglas no escritas, reglas que no necesitaban ser gritadas o señaladas para que se siguieran.Pero en la superficie todo parecía tan complejo, hasta las relaciones humanas eran complejas. ¿Es que acaso no existía las almas g...
The Death of a Monster

The Death of a Monster

Gen
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling Undertale (Video Game)
Characters
Harry Potter, Frisk (Undertale), Sans (Undertale), Flowey (Undertale), Death (Harry Potter), Death & Harry Potter, Harry Potter & Sans (Undertale), Flowey (Undertale) & Harry Potter, Flowey & Sans (Undertale), Undertale Player
Tags
Magic Death Harry Potter is So Done Major character death - Freeform Master of Death Harry Potter Harry Potter's Name is Hadrian Overpowered Harry Potter Reader is not Frisk or Chara (Undertale) Undertale Genocide Route Sans (Undertale) Remembers Resets Tired Harry Potter Harry Potter is Not Okay
Master of Death Hadrian Morte checks up on Mt. Ebott because there is an irregular amount of death there.He finds everywhere empty and filled with dust, until he reaches a very specific corridor.
His Light, Her Darkness

His Light, Her Darkness

F/M
G
Updated
14.04.2025
Fandom
Harry Potter - J. K. Rowling Undertale (Video Game)
Characters
Harry Potter, Frisk (Undertale), Sans (Undertale), Frisk's Parents (Undertale), Frisk (Undertale) & Harry Potter, Frisk (Undertale)/Harry Potter
Tags
Author Is Sleep Deprived The Author Regrets Nothing Harry Potter Needs a Hug Harry Needs a Hug Female Frisk (Undertale) Author doesn't know how how to tag Harry is a little psychopathic Corrupted Souls (Undertale) The Author is bad at Summaries No Beta we die like our prefered Genders Frisk (Undertale) Needs a Hug Sans (Undertale) wants alcohol
Harry was always a little dark, but someone had always helped keep him on an even keel.Frisk never wanted to leave her darker half, but something compelled her to jump down that hole at Mt. Ebott.Sans just wanted the kid to be okay at the end of this...
Close As Can Be

Close As Can Be

F/F
F/M
M/M
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Papyrus (Undertale)/Reader, Toriel (Undertale), Mettaton (Undertale), Asgore (Undertale), Some OCs idk
Tags
Slow Burn Kind Of Cliche Female Reader Nonbinary Frisk Reader Is Not Frisk Fluffy fic idk its a work in progress
Pureview Valley, the not-that-tiny town just East from Mount Ebott, is home to simple people and monsters alike after monsters escaped the underground 5 years ago. People come here to live peaceful lives when the big city near the mountain becomes to...
undertale asks and dares !!

undertale asks and dares !!

F/F
F/M
Gen
M/M
Multi
Other
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Chara (Undertale), Frisk (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Asriel Dreemurr, Nice Cream Vendor (Undertale), Toriel (Undertale), Mettaton (Undertale), Flowey (Undertale), Grillby (Undertale),
Tags
Romance Other Ships Not Mentioned in Tags Prompt Fic LGBTQ Character LGBTQ Themes Pride Platonic Relationships Askbox Fic Comment Fic
rules in first chapterinspired by The1andonly_soup !!a lot of these are headcanons lmao
Where the Lost Become Found

Where the Lost Become Found

Gen
G
Updated
18.04.2025
Fandom
Harry Potter - J. K. Rowling Undertale (Video Game)
Characters
Harry Potter, Tom Riddle | Voldemort, Chara (Undertale), Frisk (Undertale), Original Undertale Character(s), Sans (Undertale), Papyrus (Undertale), Toriel (Undertale), Flowey (Undertale), Harry Potter & Sans (Undertale), Frisk (Undertale) & Harry Potter, Harry Potter & Toriel (Undertale)
Tags
Family Fluff Past Child Abuse Tooth-Rotting Fluff Child Abandonment Protective Harry Potter Harry Potter is a Horcrux Harry Needs a Hug Harry Potter-centric Adopted Harry Potter Horcrux Tom Riddle and he gets one Toriel Adopts Harry
Harry is abandoned on Mt. Ebott by his aunt. Toriel left her husband after their two children died. Alone, they are broken and lost souls. Together, they are a family. (A Toriel raises Harry fanfic.)
What In The World Is Even Happening

What In The World Is Even Happening

Gen
G
Updated
19.04.2025
Fandom
Harry Potter - J. K. Rowling Undertale (Video Game) Deltarune (Video Game)
Characters
Harry Potter, Chara (Undertale), Frisk (Undertale), Alphys (Undertale), Dipper Pines, Komaeda Nagito, Enoshima Junko, Kris (Deltarune), Mabel Pines, Baldi (Baldi's Basics), Kirigiri Kyouko, Henry Stickmin,
Tags
Other Additional Tags to Be Added Chaos Not Beta Read I Wrote This Instead of Sleeping I'm Sorry What Have I Done I'm Bad At Tagging I Don't Even Know Chatting & Messaging Why Did I Write This? Ghost Chara (Undertale) Two lies one truth
It seems that adding random people from random universes to one chat might not have been the best idea.
Kaeya and the city girls drink milk and orange candy penis

Kaeya and the city girls drink milk and orange candy penis

F/F
F/M
Gen
M/M
Multi
Other
G
Updated
19.04.2025
Fandom
Harry Potter - J. K. Rowling Marvel Cinematic Universe 原神 | Genshin Impact (Video Game)
Characters
Harry Potter, James "Bucky" Barnes, Hermione Granger, Albus Dumbledore, Frisk (Undertale), Rubeus Hagrid, Kaeya (Genshin Impact), Keith (Voltron), Keith/Lance (Voltron), Tartaglia | Childe (Genshin Impact), Diluc (Genshin Impact), Diluc/Kaeya (Genshin Impact),
Tags
Depression Angst with a Happy Ending Dead Dove: Do Not Eat Alpha/Beta/Omega Dynamics Mpreg Kidnapping Sad Ending Crying Anxiety Marriage Anger Christmas
Kaeya I’m glad you’re doing meth. Yeah that’s true I don’t think it’s true. Diluc is my favorite friend group so I’m sorry. BTS cries in her sleep and Justin feels sad for him. Childe shoots arrows at him - I will never get him back.
Quantumtale After Life

Quantumtale After Life

F/F
F/M
M/M
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Original Characters, Chara (Undertale), Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), W. D. Gaster, Flowey (Undertale), Frisk/Sans (Undertale), Asgore Dreemurr/Toriel,
Tags
Alternate Universe - Quantumtale (Undertale) these are just short stories from that universe it's a bit different Female Frisk (Undertale) Frisk doesn't go back in time they just rewind the ages kind of It's mainly about Frisk and Sans They will progress in age in this Frisk is sometimes a sad bean
After a wrong RESET Frisk and Flowey got sent back in time when all her friends were around her age. The souls have been scattered around the Underground and they keep messing with time. After this RESET Sans is now able to control time. Frisk has ma...
METANOIA

METANOIA

F/F
F/M
Gen
Multi
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Chara (Undertale), Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Papyrus & Sans (Undertale), Toriel (Undertale), Frisk/Sans (Undertale), Asgore Dreemurr/Toriel, Asgore Dreemurr, Chara & Sans (Undertale), Chara & Papyrus (Undertale),
Tags
Implied/Referenced Child Abuse Panic Attacks Death Alcohol Alcohol Abuse/Alcoholism mentions of abuse Alternate Universe - Swapfell (Undertale) Overdose trigger warning Undertale AU Swapfell Swapfell Nether
*The golden flowers must have broken your fall.   It took one wrong step and Chara found themselves hurtling into the caverns below, caverns overrun by monsters who’ll do anything to claw their body apart and take their Soul. Cruelty tainted their...
Mad as a Hatter

Mad as a Hatter

F/F
F/M
M/M
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Chara (Undertale), Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Asriel Dreemurr, Toriel (Undertale), Mettaton/Papyrus (Undertale), Frisk/Sans (Undertale), Asgore Dreemurr/Toriel,
Tags
Alternate Universe - Underfell (Undertale) Victorian era Female Frisk (Undertale) Adult Frisk (Undertale) Female Chara (Undertale) Adult Chara (Undertale) Alternate Universe - Wondertale
She always felt she was different from the other people..however she never expected to be MADDER THAN A HATTER as she fell down that hole chasing a weird white rabbit. She will meet all kinds of people down in this fantastic world she discovered...th...
Upside-down

Upside-down

F/F
F/M
M/M
G
Updated
12.04.2025
Fandom
Undertale (Video Game)
Characters
Chara (Undertale), Frisk (Undertale), Original Undertale Character(s), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Asriel Dreemurr, W. D. Gaster, Toriel (Undertale), Mettaton/Papyrus (Undertale), Frisk/Sans (Undertale),
Tags
Female Frisk (Undertale) Adult Frisk (Undertale) Female Chara (Undertale) Adult Chara (Undertale) Alternate Universe - Overtale (Undertale) humans stole the monster magic and now they inherit it
Frisk is a monster that lives on the surface, however she always heard about the humans trapped underground after they stole their ability to use magic in the Great War...however Frisk is curious. As she was climbing up Mt. Ebbot trying to pick some...
some story that's inside my head

some story that's inside my head

F/F
F/M
G
Updated
12.04.2025
Fandom
Original Work Undertale (Video Game) Mahou Shoujo Madoka Magika | Puella Magi Madoka Magica
Characters
Original Characters, Chara (Undertale), Frisk (Undertale), Kaname Madoka, Akemi Homura, Undyne (Undertale), Flowey (Undertale), Lena (Disney: DuckTales), Webby Vanderquack, Chara/Asriel Dreemurr/Frisk, Nishijou Takumi/Sakihata Rimi, Sakihata Rimi,
those are story that anyone with better writing skill can adopt1)the torment of undyne2) Other idea of stories
ExperimentTale

ExperimentTale

F/F
F/M
M/M
G
Updated
13.04.2025
Fandom
Undertale (Video Game)
Characters
Original Characters, Chara (Undertale), Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Asriel Dreemurr, W. D. Gaster, Toriel (Undertale), Mettaton (Undertale),
Tags
Other Additional Tags to Be Added Alternate Universe - Medieval Female Frisk (Undertale) Adult Frisk (Undertale) Female Chara (Undertale) Adult Chara (Undertale) experiment frisk The Surface (Undertale) but it has modern technology kind of modern age? there is some bad language but it's minor a bit of PTSD involved
The monsters never knew what awaited them on the surface...or what would happen when Frisk, the last human to fall, would enter their lives. One of these monsters was Sans who was the first to be thrown off the rails of his usual resets. But somethin...
Undertale crew 1st experiences prompts

Undertale crew 1st experiences prompts

F/F
F/M
Gen
G
Updated
13.04.2025
Fandom
Undertale (Video Game)
Characters
Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), Toriel (Undertale), Asgore Dreemurr/Toriel, Asgore Dreemurr
Tags
prompts
List of prompts for the 1st experiences seriesPlease do not copy my work to any other site. The only site this work and any of my other works should be on is AO3
The Lone Star

The Lone Star

F/F
F/M
Multi
G
Updated
13.04.2025
Fandom
Undertale (Video Game)
Characters
Chara (Undertale), Frisk (Undertale), Alphys/Undyne (Undertale), Sans (Undertale), Papyrus (Undertale), Undyne (Undertale), Alphys (Undertale), W. D. Gaster, Toriel (Undertale), Mettaton (Undertale), Flowey (Undertale), Asgore Dreemurr/Toriel,
Tags
Other Additional Tags to Be Added Eventual Romance Alternate Universe - Soulmates Eventual Relationships Eventual Fluff Soulmates Gaster is aware Lunaris [OC] has special abilities Alternative Reality Traveling this fic is long Lunaris is a human who can shift into a monster soulbound
“Life is a puzzle, a riddle, a test, a mystery, a game—whatever challenge you wish to compare it to. Just remember, you're not the only participant; no one person holds all the answers, the pieces, or the cards. The trick to success in this life is t...