Look, I KNOW this is coming out on November 1st instead, but I worked on it later at night.
Sonic, Tails, Knuckles and Cosmo get to Wario's house
S: Well Wario, I made it. Despite your directions.
W: Ah, Sonic and co, welcome. I hope you're prepared for an unforgettable Halloween party.
T: Yeah we are!
W: Let's see here. Goku, Dipper, Saitama and Miku, right?
T: Yeah, aren't we just adorable?
C: Wait, you said soda and candy from a CREEPY CANDY DEALER, right?
W: Yeah.
C: That sounds very shady.
W: I tested it myself, it's fine.
S: Ok...
KN: Ooh, a punchbowl.
A knock on the door
W: Yes? Ah, you guys.
Av: Of course we came. We heard there was gonna be karaoke.
M: I may not be one for musical numbers like the others, especially Avaneesh here, but I love karaoke.
W: Alright then.
WL: Let'sa see, Beetlejuice, Zero Suit Samus, Omega and... A pirate?
M (in a bad pirate voice): Aye, that be correct matey.
Oh Boi, Shadina and Dabbit/Sulphuric are at the door
W: Hello there. Why does that guy look like Giorno with a duck bill?
DDM/SA: I'm being Daffy Duck in a zoot suit.
OB: I'm being The Joker.
Sh: I think you can tell who I'm being.
SH: Wait a minute... Are you cosplaying me?
Sh: Uh-huh.
SH: Fair enough.
Sh What is Baker Man doing, and where is he?
P: DON'T FORGET US.
s: hey guys, guess our costumes.
K: Poyo! (There's that blonde lady I was stuck with alongside Ana and Cosmo.)
L: Yeah I was, hi Kirby.
M: You can understand Kirby?
C: That's what I said.
Av: He can understand US though, right?
L: Of course.
D: And of course, the king is here.
Kat+Ana: We're here too!
W: Hello.
B: Heya chumps, I decided to be Rookie, and owlboy here is a farmer.
ST: Will you ever just call me by my actual name?
SH: I think that's everyone.
Sh: Yeah, everyone. Where's Baker Man though?
Meanwhile, while trick or treating, Baker Man falls into a portal on the ground
BM (Firmly clutching his candy, falling): THAT NEXT PLACE HAD FULL SIZE SNICKERS AND POPCORN BAGS, DAMMIIIIIT!
Baker Man falls right by Wario's house
OB: That would be him.
BM: Guys, is THIS where you were?
Sh: Where were YOU?
BM: Back home.
DDM/SA: Baker Man, the 3 of us got trapped in that Shangri La map you mentioned a few times.
BM: Really? Damn. As the crew or...?
Sh: I was in there as part of the crew, I was there with Kirby, Sans and Wario. Oh Boi and Dabbit/Sulphuric were trapped like those Brock and Gary guys who I assume are unrelated to Pokemon.
BM: Yep.
DDM/SA: Then I was in Payday with Knuckles, Papyrus and the owl guy.
ST: I HAVE a name.
BM: I love that game.
W: Alright then, I think that's everyone.
The other 4 show up in their costumes (Scratch as Bocoe, Grounder as Cubot, Carmen in her witch costume and Lum with a cat mask), shouldn't there be more? Wait, there they are (the Robotniks and Eggman in their costumes, and Decoe as Sleet, Bocoe as Scratch, Coconuts as Orbot, Orbot as Coconuts and Cubot as Grounder)
S: Oh great, THESE guys.
Eggman: Relax Sonic, this time we have no ulterior motives.
AOSTH Robotnik: We're just here to partake in a Halloween party. Mama Robotnik made me.
Mama Robotnik: Yes, I think he needs some time with actual interaction aside from those dumbbots.
SatAM Robotnik: Yes, we come in peace. Much to our disdain.
Eggman: Wait, I think we forgot the Music Destroyer.
AOSTH R: It's whatever. There's music here that they probably don't want destroyed anyway.
S: I don't trust you, but welcome to the party, Egghead and Buttnik!
T: Alright, Eggman, I trust YOU the most out of all of your minions and the different versions of you.
Peppino runs through the open window
PE: Finally, made it.
W: Hi Peppino.
P: GUYS, HOW ABOUT I TAKE A PICTURE US 3 TEAMS OF 4?
W: Our team, Sonic's team and Dedede's team?
KN: Sounds good.
P: ACTUALLY TAILS, YOU USE YOUR CAMERA, I'LL PROP THE CAMERA UP WITH A BONE.
T: Alright.
s: guys just say whatever.
W/S/D/P/T/s/PE/C/K/WL/KN/SH: (they all say something different, or just nothing at all.)
K: Poyo! (Great job!)
SH: Hmph, I look ATROCIOUS in this.
In the other room
Av: Nice, karaoke and snacks.
T: I baked cookies too.
M: Oh thank you Tails.
T: Wario asked someone to bake cookies, and I'm the only one here who knows how to do it.
BM: What about ME?
T: Well, you weren't HERE, were you?
BM: Fair.
Av: If only the Loves were here.
M: Whatever.
L: Even so, we can enjoy a Halloween party.
M: Nice, root beer.
L: Is that Harris/Conor out there?
Av: Yeah, I guess so.
Har/Con: HELLO IN THERE, I'M COMING IN.
Harris/Conor opens the door
Har/Con: Sorry I was late, I had to stop and get some gas.
Av: You aren't gas powered though?
M: Are you a robotic alcoholic?
Har/Con: One drink doesn't make you an alcoholic.
Next the karaoke begins between the narrators and their counterparts, which will be determined the exact events and songs when it's animated, but they all naturally have different tastes in music. Meanwhile, Kirby, Kat, Ana and Cosmo play Pin The Tail On The Donkey, and other Halloween party antics, including playing Luigi's Mansion: I Just Shit My Pants for the Alarmo, until the end of the party
W: Well, that was fun, but now it's sadly over.
Av: Thank you for the party Wario.
Sorry I didn't write that much of it, I'm too tired to actually flesh it out + as of writing this it's after midnight so it's technically November now.
Wait until like next year or sumn when it's animated for more fleshing out.