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To survive the Dungeon you must stay DETERMINED by RagingRowlet
Fandoms: Undertale (Video Game), ダンジョンに出会いを求めるのは間違っているだろうか | DanMachi | Is It Wrong to Try to Pick Up Girls in a Dungeon? (Anime), Deltarune (Video Game)
04 Jun 2026
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Summary
Long ago, two races ruled over the earth: Humans and Monsters. One day, war broke out between the two races. After a long fought battle, humans were victorious. They sealed the Monsters underground with a magic spell. Legends would say those who climb the mountain never return. This had been true for many years after they were sealed. But when it was time for the next Human to enter the Underground. Something changed. The mountain that held the Underground. Vanished without a trace… Orario the Labyrinth City a place where Gods and Adventurers alike flocked to the city with aspirations of grandeur. But one person was different. They never wished for glory or wealth. But rather they held a desired to be a Hero like the stories of old and they are Determined to see this through. How would desire intertwine the fates of these two worlds. Will they change for the better? Will they change for the worse? Only time will tell. But there is one thing to be sure of. This tale will be very, very interesting…
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Frisk and Chara have freed the monsters from the Underground, but the cost — paid by humans and monsters alike — has been steep. What blooms after a victory like this is not given; it must be tended. The bonds of love, of family, and of the fragile new world humans and monsters are learning to share are all theirs to keep — or to lose.
Series
- Part 2 of Where the Flowers Grow
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In 2015, Toby Fox discovered the Multiverse. By 2040, mankind reveres the AU characters, treating most like celebrities and some like gods. Naturally, unethical experiments ensue, and some humans are turned into powerful monsters for the sake of researching without disrupting timelines. They may fight to stop the cycle, but some will not come out the same as they once were.
This work was remade in protest against current censorship laws around the world after the deletion of the original copy of SDAU off of Google Docs.
NEW FEATURES:
-New content and lore
-Improved writing
-Third-person perspective for ease of POV changes
-Unabashed Dreammare subplot
-Trans plotlines for Lamia and Scarlet; otherkin plotlines for Wren and Adwin
-The villains are worse somehow
-Nearly everything has been rewritten! -
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Summary
I'm just gonna explain a few things about this series.
This story will be a month or 2 after Frisk fell down.
Everyone is still underground. (For now hint hint)
My oc will be a little girl named Charlotte that was hiking with her mother but ended up getting lost and fell into the hole.
Charlotte has long brown hair, red eyes, a scar that goes across their left eye, 5 years old, extremely talented, loves singing and playing intrsuments, survivalist, doesn't show emotions very good, adult like attitude, Empatheitc, helps others when wants too, and only talks when she wants too.
Charlotte's parents aren't the best. (Literally)
Some things may be confusing in the story, but please roll with me! Thank you!
I think that's it for an explanation.
The story will start with Charlotte finding the hole and falling.
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AU that changes into a single self-contained hard(ish) sci-fi universe while keeping all the characters and scenes mostly the same. It somehow went from ‘oh, determination is probably a kind of energy’ to ‘the Knight is an accelerationist suicide bomber who is trying to take over a the electrical grid by getting a depressed 9th grader to isekai themselves into antimatter plastic land while fighting the concept of a screwdriver’ so… y’know.
- Language:
- English
- Words:
- 9,479
- Chapters:
- 1/1
- Hits:
- 9
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Hearts on Flower Petals by Err0rc0d3__4O4
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
03 Jun 2026
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Determined hero by PantherError_13
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), Undertale (Video Game)
03 Jun 2026
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Summary
Long ago, humans and monsters lived side by side. No one remembers what started the war. But the humans won, and the monsters were sealed deep underground behind a magical Barrier created by the seven greatest mages of the ancient world.
Centuries passed. The Barrier stood unbroken. Humanity forgot the monsters — they became legends, scary stories for disobedient children. But something else vanished along with the memory of monsters. Magic itself — the power that had flowed through human blood for millennia — began to fade, until it disappeared almost entirely. No one noticed its loss.
Many centuries later, when magic was nothing but dust on the pages of forgotten books, a child was born in China. A glowing baby. The first bearer of what would later be called a "quirk." This was the beginning of a new era. An era of heroes and villains. An era in which almost no one remembered the ancient magic.
And deep beneath Mount Ebott, the monsters kept waiting.
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Silly Group Chat fic for MY soul by Dilemna_of_Brick_Wall
Fandoms: Undertale (Video Game), Disco Elysium (Video Game), Star Wars - All Media Types, Marvel (Comics), DCU (Comics), Neon Genesis Evangelion
03 Jun 2026
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Summary
I don't even know, I just want to see these characters interact I guess. Plus, I want to get a handle on my ship writing. Actually, I want to be a better writer. But whatever, chat fic so I can get in the flow of writing.
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Drabble Drabble Drabble by KTamao205
Fandoms: Undertale (Video Game), Harry Potter - J. K. Rowling
03 Jun 2026
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Summary
My Undertale & Harry Potter related drabbles
Series
- Part 2 of MultiTaleVerse
- Part 2 of Arcalith
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Frisk has done it: Monsters live on the surface. But somebody else remained in the underground.
When returning to Mt. Ebott, Frisk finds somebody else that shouldn’t be alive anymore, and with Toriel insisting that they’re family now, tries to figure out why Chara remembers things she doesn’t.
Will mercy be enough this time to save a person who seems to see themself as beyond saving?
Can everybody be a good person, if they just try?And what does all of this have to do with an alien, his human rival and determination itself?
At its core, this is an Undertale story about Frisk and Chara.Fandom-blind friendly: No prior knowledge of Invader Zim required. This crossover uses Invader Zim as support, not the main focus. All you need to know is:
Zim is an alien (Irken) trying to conquer Earth. Dib is a conspiracy kid who tries to expose Zim.Regarding the genders: This story uses feminine pronouns for Frisk and Chara as part of this AU’s characterization. Their gender does not affect the story, so feel free to read them as they/them.
Fully written with updates every 1-3 days.
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(WIP 11/?)(Is Coming Back Soon for Deltarune Chapter 5)(Done with Non-Mha Intros but I promise there will be more intros) My Dark World Hero:Underground Edition (Deltarune*Bnha/Mha*Undertale*Undertale Yellow)(Updates Whenever I can, usually Saturday) by Cuteturtle2
Fandoms: 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga), Deltarune (Video Game), Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
03 Jun 2026
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Summary
This is an Mha Deltarune Crossover, Currently Just Some Character Bios There may be Routes and Stuff but The Invite Is Mainly for Streamlining Info so will not invite everyone. The Only Ships That'll Happen Are Just What Could Happen, So no Mha Ships Just Suselle And Spamtenna as a Ship that happened in the past. There's Also Some Undertale For The Lols and KFC, Including The Cooler KFC. Clover is Referred to as Genderfluid just for simplicity due to the Yellow Team Post that Refers to Clover mainly by they but She,He, and It are used as well while Chara,frisk, and kris use full canon. Yuga is going to be used as a Parallel but is not as centric as originally planned. There will be Weird Route and Non Weird Route Options because It's fun. Maybe comment for some choices or not. Izuku will still appear and get a Signup and Yuga won't as his parallels are more on AFO and Him and the Roaring Knight and Kris for Differing Reasons. Kris is their own thing, the parallel wasn't on purpose but is now central. Weird Route Who's Frozen is Neito Monoma due to his Behavior being same level of justified and because the Bakugo Idea was a shitpost, Berdly gets to survive this time. I'll mark a Chapter Normal or Weird After this though.
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Flowey never thought he’d find himself here.
But hey, at least he’s with his best friends, right?
OR: Flowey and the people he c̶a̶r̶e̶s̶ thinks about.
Series
- Part 5 of Despite everything, it's still you.
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"are ya good at keeping secrets?"
After an accidental adventure into the underground, you've found yourself shoved into the role of "Ambassador of the Monster People." Now, it's not exactly that you didn't want to help your new friends with integrating to life of the surface; you were honored! But, you were less than prepared to represent an entire race of intelligent life.
Luckily, your new friends are pretty proactive in helping you out in the role. Sans in particular seems surprisingly engaged, for someone who identifies himself as "lazy."
He's confusing. The more time you spend together, the more you learn about him-and the more confusing he gets.You should also get more sleep. You're seeing things.
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Basically, the reader tries to balance their job and dealing with past traumas of the Underground from those around them, including a certain shiftless skeleton. -
Redemption and Revolution by thevideogameempire
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
03 Jun 2026
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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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Kat is missing and Endo needs a job! Somehow this spirals in having to go to Fairy Court! Also people are being kidnapped!
Warning: This Fanfic is not accurate to Undertale canon as the authors didn’t play Undertale when this was written and were 12. This is Book 7 of 9! There’s 2 books after this one!
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So, the general idea of this fanfic is that Chara never commits suicide and because of it they are still alive when the other humans come to the Underground.
They still hate humanity, but nevertheless aren't willing to commit suicide as they don't wish to leave their family behind, even if that selfishness means Monsters remain trapped in the Underground.
Then four years into their era the second of the eight humans arrives to the Underground, the one who arrived didn't trust Monsters and had in fact come to confirm whether the first human was dead, the fact that they weren't may be the only reason some peaceful resolution can be attained one day...unlikely, however.
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First Fallen, Not Forsaken by Your_Average_Spirit_Guardian
Fandoms: Undertale (Video Game)
02 Jun 2026
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Summary
A hundred years after dying, Chara wakes to a world that has already learned how to live without them.
The Dreemurrs, Frisk, and the people around them try to make room anyway. But for Chara, kindness feels unbearable, safety feels stolen, and survival is not the same thing as wanting to stay.
UPDATES EVERY TUESDAY & THURSDAY!
Series
- Part 29 of The Gentleverse
- Part 1 of The Gentleverse – Undertale Branch
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Asriel’s eleventh birthday is in five days, but he isn't celebrating.Despite being the Prince of the Underground, school is a daily nightmare. Cruel teasing and isolation from older students wear him down every day. His only escape is the few periods he shares with Chara, who isn't exactly a comforting presence, but they do sometimes stand up for Asriel
Chara is blunt, cynical, and holds a deep disliking for anyone who tries to push them or Asriel around.But as the countdown to Asriel's birthday ticks away, the bullies' torment escalates from words to something much worse.Five days. Five days for the tension to build, for a cruel plan to take shape, and for a single schoolyard moment to change the royal family's lives forever.
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By the Angel, this deer had a knack for getting on Asriel's nerves. She was arrogant, rude, and a complete loudmouth, seemingly unable to go more than a few sentences without spitting out an expletive.
Likewise, Dess had made it plain to the goat that she thought he was a goodie two-shoes, holier-than-thou, know-it-all church boy that had never grown the balls to go against mommy and daddy’s wishes.
To anyone on the outside looking in, it appeared as though they both hated each other.
So was it any surprise when the two of them wound up in bed together?
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Frisk…has died. Normally, that’d be the end of the story for most. But when a Shifty voice in their head gives them a second chance at life, they find it to be an offer they can’t refuse. Now they find themself alive on top of a mountain with one goal in mind; find out how they and their headmate ended up dead.
But there are ghosts that haunts the past of human and monster alike, and despite their differences, the two must band together to fend off these lingering spirits, piece together a past lost, and a WISH forgotten.
But, succeed or fail, that shifty voice will ensure that YOU get to see a show stopping performance.
OR
This takes the main concept of StoryShift (the role swap) and does its own thing from there. This is not a game.
Now with a tumblr @utghoststory:
https://www.tumblr.com/utghoststory?source=shareSeries
- Part 1 of A Ghost Story