1 - 20 of 34 Works in Tsunderplane (Undertale)
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Redemption and Revolution by thevideogameempire
Fandoms: Undertale (Video Game), Undertale Yellow
31 Oct 2025
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Summary
It’s done, after all these years, monster kind can finally be free of their prison in the underground. But not all is well. A specter from the past haunts Frisk, and only by learning to move on from the past that never was can they both find peace. Meanwhile, another specter haunts the world. A war is brewing once again between the ways of old, and the way of the future. Dreams of world revolution and a classless society reignite, and soon the world will be divided between those who wish for a brighter future, and those who cling desperately to their own past that never was. Soon, the recently emerged monsters will need to choose what role they will play in this conflict, and what their place will be in the world.
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Undertale but something is different by Ruby_Velvet_Gloom
Fandoms: Undertale (Video Game)
25 Aug 2025
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Summary
Heheheh
- Language:
- English
- Words:
- 100
- Chapters:
- 1/?
- Hits:
- 17
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Cyberangel - BSD x UNDERTALE by orphan_account
Fandoms: 文豪ストレイドッグス | Bungou Stray Dogs, Undertale (Video Game)
03 Mar 2025
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Summary
Ranpo is done with the Decay of Angels, refuses to take the case that the government requested a meeting for, took a walk to clear his mind, and ended up at Mt Ebott. It is illegal to climb it, but who cares anyway??? Whilst Ranpo's looking down the strange gigantic hole, Dazai gets teleported as a malfunction in Nikolai's ability.. on top of Ranpo. What could possibly go wrong?
(ON BREAK!!! WILL BE BACK IN UNDER A YEAR!!!)
Tags update as the story goes
Characters are not mine! They belong to their respective fandoms.
oops i forgot to update the location mb uhhh
Souheki current location - CORE
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Summary
A What-if fic based off of “What if Frisk aged with Resets?”
Fem!Frisk headcanon
Male!Chara headcanonFrisk in 1st Chapter: 13
Frisk in 11th Chapter: 19
Same goes for Chara (Although Chara is slightly older than Frisk by about 2 weeks) -
The Itch by StripesnBooks
Fandoms: Undertale (Video Game), Underswap (Fandom), underfell (fandom)
25 Jun 2024
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Summary
You're in a gang situated near Ebbot City, and you live for the violence. You're not without your morals, they're just... flexible. But when one of your monster friends invites you to Grillbys, they might have accidentally brought you into a world of trouble. Can you keep your new skeleton friends from learning of your gang affiliations? What will their brothers do when they see your LV and EXP? And why are the amalgamates disappearing one by one, including your best friend Reap?
Featuring friendly amalgamates, drama, high tensions, and traumatized skeletons, what will you do as your list of people to protect grows far faster than you ever expected?
Series
- Part 1 of Homes After the Mountain
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Summary
After rediscovering an old journal Wingdings kept as a teenager, old feelings about his identity resurface and he’s in denial about the whole situation. Thankfully, an old friend and surrogate parent is there to help him. This leads to Wingdings’ journey of self discovery.
Series
- Part 1 of Triple G Universe
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You run away. You fall into a pit, and there are monsters at the bottom. They don't look like monsters should. They all have the same face. It makes you uncomfortabl
Series
- Part 52 of Two Steps To The Left, And a Long Fall
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Reach into Oblivion by Crossed_Omens (Macabre_Handyman), DREZMOR (Macabre_Handyman)
Fandoms: Undertale (Video Game), Deltarune (Video Game)
26 Aug 2023
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Summary
In the small town of Hometown, everything is almost normal. Most of the towns population is made up of monsters, except for one. Kris (Age 17), the adopted child of Toriel and Asgore Dreemurr. Their brother, Asriel, attends a good college far from Hometown, as Kris goes to a fairly small high school. In the school, Kris sits with 14 other students, they are mostly silent, only talking when necessary or when they feel comfortable, often sleeping in class and not calling any attention. Susie (Age 18) is one of the students, a troublemaker who had been held back one year, nobody knows much about her, and because of her reputation, nobody dared to find out. Everything seems as it should be, until fate puts Susie and Kris into an adventure that would forever change their lives. When the duo is put up against unknown forces and powerful enemies, they will have to call upon unlikely allies, venture into new worlds, and stand together as one to save the world from oblivion... or die trying.
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Prompt: Can you write a multi-chapter Undertale fanfiction?
ChatGPT: Sure! Here's Chapter One of an Undertale fanfiction: -
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Mostly a excuse for silly genocide jokes, but the story can still get pretty brutal.
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You are Aliza. You are always hungry and cold and hunted. And you escape. Somehow. Somewhere kinder.
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ECHOFALLS by RubyHobbit
Fandoms: Undertale (Video Game), Underfell - Fandom, Flowerfell (the original)
18 Jul 2022
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Summary
ECHOFALLS is an Undertale AU based off of UNDERFELL and the ORIGINAL FLOWERFELL. if you don't know FlowerFell is actually not a FRANS AU and was taken down because people didn't want to do all the work that I am doing and create a new AU with its own story and have its own ending and its own lesson to get what they want and instead decided to just change a little of the story and make Sans (someone in his 20s or 30s) date Frisks (who in the story was at most a teen but probably still 10). Why I don't know maybe they have a competition with Sans or something. I however feel that is horrible and wrong and I want the creator to know that their story is still theirs and hopefully bring the original back.
The ECHOFALLS AU is an AU where two twin girls fall down a Chasm and wake up in the underground at different times. Both of which change the underground forever. Every time either of them dies a blue echo flower grows on them and has an echo of the last thing that was said right before they died if someone interacts with them. We start with one but end with another, will they be free or will they remain underground in eternal silence and slumber forgotten by the Humans above. -
About Sans, who wanted to find out who pooped on his head by Nurrenbri
Fandoms: Undertale (Video Game)
24 Apr 2022
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Summary
A touching story about how a short skeleton, waking up and looking out from his guard post, discovers a warm hat on his head…
- Language:
- English
- Words:
- 1,221
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 87
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Summary
Tumblr prompt was Alphys + broken wings
Alphys receives an unexpected visit looking for help.
Series
- Part 4 of Tumblr Requests
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SaviorTale by Astronomically_Dumb
Fandoms: Undertale (Video Game), Undertale AU - Fandom, Saviortale
07 Mar 2021
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Summary
What if you were a background character in your own story? What if everything you did was meaningless?
Until now
OR
What if Andro finally means something
OR
Andro goes into the underground and fucks everything up
Series
- Part 1 of SaviorTale
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Jet Fuel Is Thicker Than Water by Ononymous for CoramDeo
Fandoms: Undertale (Video Game)
05 Jan 2020
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Summary
Someone whose entire M.O. is to hide their feelings behind aloof disinterest doesn't sound like the best idea for a last minute babysitter, does it? Well Tsunderplane's cousin doesn't agree with that. Even if Tsunderplane herself might...
Series
- Part 11 of Christmas 2019 Stories and Requests
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Juggling the burden of forgetting about his past, Sans is trying to cope with his life of nihilism. This is all made complicated when Frisk falls into the underground and a fallen child named Chara is attached to her soul. Is Frisk the key in helping monsters go free or will she leave the underground in a trail of dust?
Series
- Part 1 of Delta Saga
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Undertale Oneshots! - Send Help :') - Wattpad by GirlWithTooManyOcs
Fandoms: Undertale (Video Game), Undertale Alternate Universes - Fandom
15 Mar 2019
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Summary
Tsunderplane gives birth to Temmie even tho they are a virgin so Tsunderplane is now the underground’s version of the Virgin Mary. Later monster kid plays video games. Much later Mettaton goes on a killing spree. Flowey even pops up for a second XD XD OwO
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All you want to do is go home. Why do all of these monsters want to kill you? Or maybe they want to kiss you. Hopefully not in that order.
That's right, (Name). Flirt your way to safety.
Underfell Pacifist Route, no deaths. Reader unintentionally seduces... everyone. How many unwanted suitors can we rack up in one fic? Let's find out!