underswap 

An alternate universe (au) of undertale where the main characters (and maybe more) are swapped.

You: Hey, whats Underswap?
Jimmy: Pretty much undertale but the characters are swa-
You: Oh, its a knockoff.

underswap by The great Vicente December 1, 2016

Underswap 

A simple alternate universe of undertale where the role of all the characters are swapped thus making it very weird and fun to play. It defies the logic of gaming.

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Alfred: Hey, do u know about underswap?
Larry: That game is an insult to logic.
Alfred: Alright, screw off normie bastard.

You don't know what exactly an au is.
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Underswap by Retardost December 13, 2021

Underswap 

An Alternative Universe of the popular game Undertale where charaters have switched and SWAPPED roles

"Did you find the Underswap blog yet?"

Underswap by SwapBlueberry April 15, 2024

Underswap Papyrus 

A weed addicted skeleton with cheesy jokes and a short blueberry brother.

Person 1 : DUDE IT'S UNDERSWAP PAPYRUS---
Person 2 : Who?
Under Swap Papyrus : *Slap*

Underswap Papyrus by WeedDaddy April 4, 2017

Underswap Sans 

Underswap sans also known as blueberry or blue is an AU of sans from undertale. Blueberry can be seen as a sweet adorable person you just want to hug.

Underswap sans gave Kyle a gift, they're so nice.
Blueberry is just so adorable and friendly.
Don't you just want to give blue a hug?

Underswap Sans by Alice Butter March 13, 2021

UnderSwap Papyrus 

He is basically UnderTale Sans but in Papyrus body so he has the body of UT Pap but the personality Of Sans. (btw Us stands for underswap)

Underswap Papyrus: hey bro can you get the honey for me..
Underswap Sans: But brother you are Literately 2 feet away from it!
Us Papyrus: but u are too. :|
Us Sans: FINE! But only this once brother. Next time you need to get up and get is your self.
Us papyrus: k, thanks bro.

UnderSwap Papyrus by TheBiggestUndertaleFan November 22, 2021

Underswap Sans 

Underswap Sans also known as blue or blueberry is an AU of sans from undertale. Underswap Sans can be depicted as a kind,sweet, and adorable person who you just want to hug.

Underswap sans is so kind, they gave Kyle a gift.
Blueberry is so adorable I can't get enough.

Don't you just want to give blue a hug.

Underswap Sans by Alice Butter March 13, 2021