A Random Role AU that sounds like it was made by a pothead

Frisk<->Orion (OC)
Flowey<->Baldi (Baldi's Basics)
Toriel<->Monika (Doki Doki Literature Club)
Napstablook<->Sans/Papyrus (Undertale)
Sans/Papyrus<->Thomas (Thomas And Friends)
Undyne<->???
Alphys<->???
Mettaton<->???
Asgore<->???
Asriel<->???
Chara<->???

Dimensional Discord

The Frisk Replacement is Orion, a child created by this pocket dimension. Orion sets off on his quest to find his long-lost family, and he is bound to meet many strange friends along the way.

002 - His name, please?

003 - Quick Maths

Monika<->Toriel
hopefully the final time I need to fix something

004 - Just Monika

Ruins Dummy<->Random stuff piled up that kinda looks like gaster

007 - Confrontation

this plays when you die, also here's Orion, the frisk replacement. don't ask why he is blue

Originally this was his redesign but it looks a little fuggly so I might change it

011 -Rest in Peace

I updated it cuz it felt less like a heartache replacement and more like a weird track 71 replacement

I also am not sure what the context for this will be

014 - Existential Crisis

*An assortment of anomalies block your path!

009 - The Gloves Are Off

T: *Hey human I ran a train on your mom last night
O: *Eat shit fuckass]
Relevant swaps:
Sans -> Thomas (T)
Frisk -> Orion (O)

006 - thomaslovania

I fixed the drums because they sounded like horse shit

But anyway uhh hi this is my Random Role AU. Several Entities have dissapeared from their home worlds and have been living in this pocket dimension
Ending Leitmotif by https://soundcloud.com/horror-nathan

001 - Awakening

Plays after Monika's Battle. Baldi is unaware of his furious pursuit earlier, and had just woken up from being slammed into a brick wall.

018 - Afterschool Visit

[You knock on the door]
[A tiny slot in the door opens, revealing a pair of pink, tired eyes connected to a white, furry face.]
???: *Wuhh....?
???: *...What's the password...?
???: *.....
???: *...Hey, aren't you a little young to be buying this stuff?
???: *Read the sign, kid! No minors allowed!
[The slot shuts.]

Relevent swaps:
Frisk -> Orion
Glyde -> Mammott/Furcorn/Epic Wubbox

020 - Mammott's Pot Shack

021 - Truck Taunt

*I advise that you are careful when continuing forth, Orion. 
*I have seen anything, and everything that can happen here, and I can't help but have this.... sinking feeling that danger will soon cross you.

Relevant Swaps:
Sans -> Thomas
Frisk -> Orion
Grillby -> Victor

Also I am removing Percy from this AU

I should also note that the Leitmotif in question is a modified version of the beginning part of "I want to go home" from Journey Beyond Sodor.

028 - Sinking Feeling

[You hear the sound of a train puffing close.]
[You turn around to see a blue train.... with a face....?]
[The train stops at the station, and lets out a deafening whistle. You clamp your hands over your ears]
???: *Oh, dear! I'm sorry, I didn't mean to scare you! I sometimes forget how loud my whistle is...
[You remove your hands from your ears, the train smiles at you warmly.]
T: *I'm Thomas, Thomas the Tank Engine. And, you are?
[You tell Thomas your name.]
T: *Orion? Why, that's a great name!
T: *I take it you need to go somewhere?
[🔷Yes]                    [No]
T: *Well, hop on, then!

Dimensional Discord is the first AU I have ever started to actually work with. It's basically the same plot as any other random role AU, so don't expect an original plot.

Our Sans replacement is Thomas the Tank Engine, from Thomas and Friends. He also doubles as the Papyrus for this AU. As observed, Thomas is his usual, cheeky self here, even when trapped in a possibly inescapable pocket dimension. (not entirely sure what else to say about him.)

015 - Six Small Wheels

[There are two skeletons blocking your way.]
[Ask them to move?]
[🔷Yes]             [No]
[You tap on the tall skeleton's shoulder]
???: HM?
???: OH! HELLO, HUMAN! DO YOU NEED SOMETHING?
???: WE'RE BLOCKING YOUR WAY! OH, APOLOGIES FOR THAT! HERE, I'LL GET OUR OF YOUR WAY.
[He's very polite for what you assume is a halloween decoration.]

010 - Out of Season

Just a another random role au
OST might not be uploaded in order sometimes