Fellswap Stories

(this is Sans Aus and Papyrus Aus x Male!reader fanfic , pls don't say anything weird about it as this is for my own entertainment -) (Also I take the tags from my AO3 s...

What if a FGod Error jumped into the void and fell into another multiverse and gained an AU were he has a father, twin brother, and younger twin sisters but the younger...

What if..someone from our world was reborn as fellswap sans? But an accident when he was young leads to becoming blind for a long time and papyrus feels guilty about not...

Y/N, a 20-year-old ((Insert gender)) in the city below MT. Ebott, who gets fired the day they were going on MT. Ebott and they didn't know going up this mountain would c...

This is about the Alternate Universes of Undertale, about a new monster. A Human-Monster Hybrid, she was an experiment of W.D Gaster. Gaster wanted to see if it was poss...

Echo had a plan. A really good one. Free Monster kind from the spell casted by humans. Find her sibling who disappeared. Then undo the curse placed on her. But when she...

Under the training of Dr. Strange, (Y/N) is learning to control her powers. But when she i left alone for the first time. Skeletons suddenly start appearing out of nowhe...

Just a book about blue getting the attention of pretty much all au's now they want him might update this description sooner or later maybe never but it's whatever. Anywa...

(As far as I know, no one has made a story about naturetale like this so..and the only reason why I writing one like this is because of fatal error part 5? Or part 4, go...

I was reborn as sans from my own made up au. How did that happen? I have no idea. Luckily I was still a kid so I didn't have to act like how I made sans to act like but...

You were always put in second place due to your sister being favored over you. No matter what you did it always seemed that you both were competing against each other. Y...

What if someone from our world died knowing a lot from the undertale and their multiverse/underverse? What if that person also knew about the balance and didn't creat to...

was originally from quotev, just thought it'd be fun to hv it here aswell this just works for my own benefit for where ideas go but not die (yet). Most of these woul...

papyrus, aka Puff, is a bakery owner she is 22 years old and looking for help at her bakery uf papyrus aka edge is a employee at a employment senior his 'buds' with puff...

A one shot book of my gaster AUs so far and that I can remember This will include GenderTale (Gast/Galia) GenderSwap (Light/Ludmila) GenderFell (Honey/Heloise) FellGende...

What if someone from our world was transported into Swapfell sans as a second personality while the sans was just a mere babybones? (Different things, different personal...

From the Omverse discord server, i had this fun fight with the cool guy Tyrannos, and I'm saving it as a book.

Geno is a lonely thief, resident of a small sea village. His past is covered in darkness. Somehow he can't recall who he was or his parents. He only had his 2 younger br...

includes - All Aus (so far) - Journals (from characters) - Character lore (By creator [There may be multiple of an AU character]) - Pictures for lore - Videos for lore (...

She's been here too long, drifting through a space devoid of time and reason. Speaking to ghosts long gone and echoes of her own voice, a lesser being would have gone ma...