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Undertale Adventures! by FizzySunpop
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game), Deltarune (Video Game)
11 Oct 2025
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Summary
Republished for Undertale's anniversary, and will (hopefully) be continued past the two chapters I finished before.
Old description:
"Idrk how to exactly describe this story outside of saying something like 'Undertale/Deltarune Cinematic Universe for both official and fanmade content'. Like I really tried to make an in depth description but I. Cannot.
First Chapter is rather short but I didn't feel like it should have been labeled as a Prologue."
The description is still true, I still do not have any proper way of describing this story in my mind. The first arc, obviously, is an adaptation of Undertale with content from several mods, fangames, or similar AUs. After that, I will mainly focus on adapting Prequel-based content such as Handplates or Undertale Yellow before going into Sequel-based content, whether that be adapting Undertale sequels or adapting something that isn't an Undertale sequel but the arc based on it is still after the Undertale arc (like, say, an Overtime arc- or- or Deltarune, I could've just said Deltarune....)Series
- Language:
- English
- Words:
- 8,991
- Chapters:
- 3/?
- Hits:
- 41
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Chara died, and wake up again as a ghost, the first thing they see is a monster trying to kill a human kid, so they make the most reasonable assumption they can think of: The human did something so evil even nice monsters want to kill them. (they're wrong) They will do something about it even if they can't interact with the world, other than talking to the human, they just need a good enough plan... they just have to be creative!
Frisk just fell in a hole and now there are people trying to kill them and also they're haunted... which sounds worse than it is, because they are haunted by this... small kid, who probably can just talk to them and nothing else, the one problem is that they keep telling them to go fight someone for some reason, and they are being very annoying about it...
...Anyway basically Chara is a small gremlin child that gives Frisk headache occasionally... sometimes... usually... they'll be freinds eventually. (didn't take that long, honestly)
(This used to be a one shot, you can read the first chapter that way if you want to, the story kind of change... a... more than a bit, so I changed the summary, the old one for the Oneshot is in the first Chapter Note below here)
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Frisk has a nice walk home with their closest friend from the underground and reflects on a few things.
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Ever wondered what happened after the true pacifist ending, ever wish you could see all your favourite characters live out their happily ever afters on the surface, want to see what life is like when humans and monsters start living side by side again,
Well, since it seems like a proper sequel to undertale is never gonna happen, I've decided to make my own version that encapsulates everything I loved about the original game and how I think things would play out after the ending,
Hope you enjoy the story.
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Another Child Lost to the Mountain (Building a New Future, With You By My Side) by LizaVet
Fandoms: Undertale (Video Game)
15 Sep 2025
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Summary
Frisk could feel Chara narrowing their eyes at them. "Seriously, can you please take that stupid bandanna off your head?" Chara sneered. "It makes you look ridicul-"
"Mandanna," Frisk interrupted.
“…excuse me?”
"Mandanna. Not bandana."
”Are we seriously gendering the bandanna just because it has abs on it?”
"Yup!"
”…I really wish that others were able to hear your sass.”
"I don’t know, I kinda like the idea that you’re the only one getting to see this side of me." Frisk looked in the window of a house they were passing by, winking at their reflection in it. "Makes you special, doesn’t it?"
”I- Stop flirting with me. I’m a dead person’s voice in your head!”
"No."
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A child falls into the Underground and discovers a world beyond their imagination. Between the monsters, the magic, and the power to undo their mistakes and make everything right, they find happiness in places they would have never imagined. But when things start to get difficult, will they have the strength they need to keep fighting? How much pain are they willing to suffer to make things right? How much are they willing to give up to reach their happy ending?Series
- Part 1 of ACLM
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Are you… there?
Are we… connected?
…
Greetings.
Why don't we…
…just get to the point?—
Written in celebration of Undertale's tenth anniversary. More chapters coming once I finish other projects.
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CHAPTER ONE: “PUSH COMES TO SHOVE” by P0WP0W
Fandoms: Undertale (Video Game), Sans AU - Fandom, Nightmare gang - Fandom
21 May 2025
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Hello, thanks for clicking on this FANFIC!— This is basically me hyperfixating on “HORRORTALE” and
the storyline with how the nightmare gang realistically would work?So basically, From first aliza perspective of how her live was for two years straight in the AU- “HORRORTALE” before magically Running into a portal, transporting her into a strange place where a lot of humans and monsters collectively meet together before she knew it— seeing familiar various versions of monsters she knew and even ones from her PLACE.
Collectivity she meets different humans, especially involving ones who was associated with ``Nightmare?—``
So hope you guys enjoy, sorry for the rushed writing, this is my first time doing this.
- Language:
- English
- Words:
- 1,751
- Chapters:
- 1/1
- Kudos:
- 11
- Hits:
- 126
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Aliza, a young child, has fallen into the underground.
They do not remember anything from before she fell, nor do they recognize where she is.
As they explore the underground, with her new friend Chara, they begin to understand that the underground has changed.
But they don't want to leave these poor monsters in this state, like the last human did.
She wants to free the monsters.
The question remains the same.
Will they live to the end?
Or will she die like so many before them? -
Undertale: The Royal Hunt by TooManyJays
Fandoms: Undertale (Video Game), Deltarune (Video Game)
01 Apr 2025
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"The little girl just could not sleep because her thoughts were way too deep, her mind had gone out for a stroll and fallen down the rabbit hole."
Frisk, a teenage girl of 16, wakes up after a fall and finds herself in a strange, magical kingdom of monsters.
Only this underground world is not what it used to be.
The king has turned insane and has been unseen for years. Meanwhile, it has turned cruel and oppressive as a group of violent and sadistic warriors known as The Royal Hunt work has taken control, working as judges, juries, and executioners, led by the mysterious self-proclaimed champion of the elusive King Asgore...Now, in this suffering kingdom, Frisk meets strange new souls and learns forgotten lore of a faded era, suffering through thick and thin and dying countless times to reach home, all while reality seems to sometimes break around her. Thankfully, she has one ally she believes she can fully trust.
A helpful little flower called Flowey...WARNING: This is a dark and violent story featuring MATURE THEMES, GRAPHIC DESCRIPTIONS, SWEARING, AND GORE, so if you are too squeamish or simply don't like those sorts of things then I suggest you go back.
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- Part 3 of The Shattering. An Undertale AU
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After Frisk and Kid manage to break the Barrier and free the monsters from the Underground, the humans and monsters of Ebott must learn to get along.
Heheheheheh, good luck with that...
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- Part 2 of United SOULs
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In Waterfall, in the Neutral and Pacifist runs(more common in Pacifist), most players will rush to help Monster Kid when they trip while on the bridge. But, what would happen if Frisk rushed to help them, but wasn't in time?
This is one possible outcome.
Series
- Part 1 of United SOULs
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Seventh - A Prologue (Undertale AU - Mirrored Edge) by JacketOfDiamonds
Fandoms: Undertale (Video Game)
31 Dec 2024
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In a world characterized by grim reflections, one Royal Knight has a difficult day. But then again, he doesn't have the worst of it.
Warning for fairly canon-typical involvement of child death and suicide, brief implication of parental figure death, and mildly unsanitary activity (Jerry).
Series
- Part 1 of Mirrored Edge
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Written for the 2024 Frans Secret Santa on Tumblr. Everyone is tired of Sans and Frisk romantic circling and do their best to get the two together; what they don't realize is that the two are already together and are using the matchmaking as an excuse for some privacy together.
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Once upon a time, a human fell into the Underground. They killed as many monsters as they spared and disappeared through the Barrier, leaving the monsters with no hope of escaping and only their vengeance to fall back on. The Queen is exiled back to the Ruins, accompanied by her grieving friend hiding a secret from her. The Empress seeks revenge. Dr Alphys disappears into her lab and never returns.
Six years later Frisk returns to the Underground, haunted by dreams of the earth splitting in two and pillars of darkness.
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Frisk, Asriel and Toriel begin their first day at school. Asriel struggles to settle in, being one of few monsters in a school full of gawking humans. Frisk finds himself surprisingly popular as word of the barriers destruction because of his actions begins to spread across school. Asriel gets jealous when someone from Frisk's past sits next to Asriel in class. Asriel has another strange dream and after returning home he makes the decision to give Frisk a gift he had been holding onto.
Series
- Part 5 of Dimension Tale Part 2: "Epilogue"
- Part 7 of DimensionTale
- Language:
- English
- Words:
- 6,959
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 123
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Plan by ChaoticMoonSpace
Fandoms: Chonny's Charming Chaos Compendium Vol. 1 - Chonny Jash (Album), Undertale (Video Game)
20 Aug 2024
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After seeing something the Bluestarlett posted, I turned on comment moderation just to be careful. This isn’t lore relevant, just important. (Fic is important, summary isn’t)
Series
- Part 8 of A plea with our god
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W.D Gaster is back and misses his sons. by StarShapedTriangle
Fandoms: Undertale (Video Game)
27 Jul 2024
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Gaster is trying to remind his sons he once existed. And wants to be reunited again...his attempt didn't exactly work.
***fixed tags -
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“It… was just a nightmare. It’s alright, I’m here.”
Frisk sat on their bed with Chara following soon. Neither spoke a word, it wasn’t necessary. In a quick moment, Frisk broke up and hugged Chara tightly. The other human didn’t expect that but accepted it nevertheless, hugging them back.
OR: 4 times Frisk was there for Chara and one when they returned the favor.
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Monsters are finally free from the Underground, and Frisk has returned to the surface with all their friends. The battles are over and the heroic journey is finished... But happy endings don't just appear by magic. They take time and effort (alright, and maybe a little magic), and you take them one day at a time. This is a lesson that Frisk, Conor, and everyone else still have to learn for themselves.
Series
- Part 2 of Walk With Kindness
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Now that monsters have gone to the surface, Frisk is busy trying to maintain peace between Humans and Monsters, who aren't getting along peacefully. But that all goes out the window when Frisk is given a mission: To save the other children who died in the Underground. To complete this mission, Frisk must go on a journey across time to resurrect the fallen children...
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