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I'm...swap gaster? by KarmaAkabane425
KarmaAkabane425
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    Parts 22
Yeah sorry gained an idea on if someone became swap Gaster Also they may be apathetic or just confused on their feelings and MAYBE Autistic, I may be a bit wrong on apathetic or not completely accurate idk yet And it's a huge maybe on the autistic part it might be mentioned at some point or not I usually don't do this kind of story on something like using apathetic and perhaps autistic but i decided I wanted to try. And the maybe confused kind feelings is not knowing what they feel or if they even feel anything and all
Celestial Roommates by xHowToLoveADragonx
xHowToLoveADragonx
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    Parts 20
"So your possible roommates are already up there, I let them check it out since you were a little late..." Codie catches something. "Wait, room-mates? I thought there'd be just me and one other person?" Mrs. Simmons turns to look at her sheepishly. "Well, technically it was just one roommate. But since last week it's two now that they're separated..." she trails off. Codie frowns in confusion but the manager waves her off. "It's alright, they're very nice, I'm sure you three would get along." 'But there's only two rooms...' Picture is not mine! Cross posted from AO3
Multiverse's Unwilling Protector by Lxzaruss
Lxzaruss
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Formerly known as, "I Became the Forced God of Creation". !!STORY COVER IS MINE!! What if.. Error isn't a forced god but Ink is? What if Ink had enough and committed death and chose someone to be the next Ink, the forced god of Creation? What will happen next..? Will they end up like Ink or.. A brand new fate and destiny awaits..? (FGod concept which is not mine and this story is an original idea of mine. Undertale doesn't belong to me nor any of the characters shown in the story. That's all thanks for reading.) (FGod Ink belongs to me, FGod Error belongs to Harrish6.)
A Younger Brother's Love and Determination  by UnderTaleHyperFixed
UnderTaleHyperFixed
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This wasn't his first life, wasn't even his second life. He was now on his third life. Who was he? First he was a human named Jaxon Miller. Then he was a magic skeleton names Papyrus, nicknamed Edge by his counterparts. Now? Now he wasn't sure who he was, all he knew is that after he as Edge forced a Multiverse reset to save it he was floating around as a Ghost, or maybe Spirit? Then he was in the body of a young Papyrus and he didn't have a brother this time. He may not know what's going on, but he was gonna get back to Red if it's the last thing he did!
Orca-Mer In The Deep Vast Oceans  by UnderTaleHyperFixed
UnderTaleHyperFixed
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Someone dies and is reborn as an Orca-Mer. A skeleton Orca mer actually, with magic as well! Hopefully they can survive in this new life...
Friends Meeting Enemies by AngelGold238
AngelGold238
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What if there was a multiverse where Error and Ink were friends? What if the voices were the creators? What if they went to the Fgod multiverse because the voices were bored? Fate is mad that they can't take control of the new Ink and Error. And everyone is confused. ------- I'm making Error and Ink somewhat more like their canon personally the only difference is that they are friends. (No shipping sorry) Fgod AU belongs to Harish6 Ink belongs to Mye Bi (Comyet) Error belongs to Lover of Piggies (Crayon Queen) Art not mine First book
*HIATUS* Mer!verse Continuation Rewrite by UtAU4life
UtAU4life
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After Error gets ambushed by Ink and his followers, he goes to Outertale where he drops into the bottomless void below. Will he finally be able to have peace for once in his long life? Or will he be stuck in the void forever? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ okay, so I'm pretty bad at descriptions, sorry. This is the rewrite for my continuation of a story called 'Mer!verse' by RaDaSunGod!, and the fgod concept belongs to Harrish6. Go check them both out! Also, if you are new to the undertale fandom, this story will be very confusing. Be sure to know the skeletons outside of just the AU undertale as I will be mentioning multiple monsters within multiple AUs.
I'm reborn as nightmare but as a mer? by DancingAce1
DancingAce1
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Why did I suddenly awake in a huge fish tank? Did I get reincarnated as a fish? *Looks down at myself* ...do fishes nowadays have an upper body of a skeleton or is it just me? Also who's the fellow skeleton mer beside me? They look like... Dream sans?! What the hell? What is this? Is this a freaking dream because if it is this is not funny!
Reborn as nightmare but different by nightsimp23
nightsimp23
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No spoilers this time :p Cover not mine lmao
The Path We Walk by Lunazul3000
Lunazul3000
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Aster Corvus Concord, now known as Sans Serif Gaster, was living a relatively peaceful life having reached the surface. Then it all reset. Now, after living through an endless cycle of genocide runs, the human asks to join forces to kill the underground. Will our reincarnated protagonist join in the carnage? Or will they continue the cycle. Do they even have a choice? Hit 1 in #killertale 10/2/22 1 in #cross 9/13/22 1 in #fgod. 9/14/22 6 in #blueberrysans 9/15/22 5 in #error 9/22/22 2 in #errorsans 12/3/22 9 in #reborn 12/1/22 Check out my other books! May contain mature language, violence, torture, sexual, self-harm, and suicidal content. May not be suitable for all viewers. I don't own undertale. All non-oc characters belong to their respective creators. Inspired by harrish6, pastagod_italy, nellie sheerin, and Firehedgehog