Smoke Choked

If it had not been for this fan game popularizing the original Pasta, we wouldn't have the recent masterpieces that are Sonic.EXE: PC Port, Mario '85, and especially not the Vs. Sonic.Exe mod.  Plus, we wouldn't have Hill Act 1.gym, either.
This was the game that started it all, based on the original Shitpasta from 2011.  This was the version that had voice acting and off-course Easter eggs added in.
By MY5TCrimson
  

MOOSEN
By UVA876 AND SHIT
 
 

I would put this in the Capcom Edits section, but since this was not made by Dronk himself, I feel that the YouTubers section is more appropriate.
It's a Dan edit based on(?) Dronk, a relatively well-known M.U.G.E.N. creator and YouTuber. Comes with a Violent mode in a separate def file.
By JtheSaltyy
 

Minos Prime is the second and final boss of [ P-1: SOUL SURVIVOR ], released from the Flesh Prison upon its destruction. Though he proclaims his gratitude to V1 for rescuing him, he condemns V1 to death for the machines' crimes against humanity. He is considered the most complex and difficult boss of Act I.
By Z-9 Lurker, major help by Lillie's Mads
 

The best OP JUS char edit DirectX with Dragonball sounds is here!
Credits: 
David11: Coding the char, song composition, video editing and trailer. WolfStak: Code tech support
Gekio: Art direction 
Nimpos1: Hosting
Jon-MG: Planet-sized bolas advisor
GanjahSkate: Main idea thief
Jojoland: Beta testing and Hype squad
Rivelio: for robar mis codes!
Any other credits you guys see fit, you can add too.
 

I don't know why this exists
By TMC55 and Diamondswag12 Productions

The ultimate SpongeBob, being an absolute revision of the most famous and iconic SpongeBob version made by FelixMario.
This version is Still MVC2 gameplay with a New effect, Sound effects, and Voice Clip used for "Spongebob Battle for the Bikini Bottom",
"Spongebob Truth or Square", and "Plankton's Robotic Revenge". Unlike the recorded video clips.
Changelog - 9/9/21:
- Updated on his power charge after he's stuck in post-round
- Added super effects
- Air Jump set by to 0 after he jumps twice instantly
- Normal Attacks Smoothly Changes
Changelog - 2/12/22:
- Fixed some effects performing by misaligned position
- Rearrange voice-over in normal attacks
- Fixed Super Portrait in Emit Large Tomato Sauce
By Infantry00 - Originally made by FelixMario
 

Voodoo Spike himself, hailing from one of the Ranma ½ fighting games, Ranma ½: Hard Battle. If I am not mistaken, this version of Gosunkugi is designed to be source accurate, much like the creator's own Pantyhose Taro.
By YU-TOHARU

The OG funny animal of cartoons himself, Felix the Cat! This is the original version of this character, not Dawn de Era's edit. Crowsar, the author of this version, dislikes Dawn de Era's edit, especially since Dawn de Era's version changed up the gameplay all together from his vision.
By Crowsar
 

Another Japanese .exe game, this being a game where you destroy Kirby in RPG Maker.
By Star_Island
1st file: English version
2nd file: Japanese version
 

An unofficial adaptation of Talking Bella, now as a (mostly) playable app for Windows and Android.
By 32kbye
1st file: Windows version
2nd file: Android version
 

The story is about the powerful Arch-Demon Exetior escaping from a hellish prison, Being perused by the guards of hell, He decides to use Sonic's body to remain undetected. Trying to take control over him, Exetior is unable to do so. Due to Sonic's strong will, he will have to destroy Sonic's main points of determination. Tails, Knuckles, And Eggman...The Arch-Demon decided to deal with these three. So that he can fully take control of Sonic's body...
By JaizKoys
1st file: English version
2nd file: Italian version
3rd file: Russian version
 

As is tradition with Ohgaki's other characters, Cammy is just as formidable as usual, but now she's a shortstack!
By Ohgaki
 

Based on CHOUJIN's Perfect Cell, transformed into a masterwork by Turbo
Based on this video: 
 
Showcase video, compared to the original Perfect Cell:
 

Boyfriend and Pico struggle against the glitch, and it seems that they are fighting a losing battle!
By FP, bruh_man, Smash Creeper, Veemo, BFBAnimates, Kreagato, Jen, and sylv
 

From WikiPedia, the free Encylopedia, this guy represents just how hard Where's Waldo is on the NES, according to Joel.  This guy ended up becoming the kinkiest bastard in all of The Sims 4 Meme House.  watch your back!
By Brergrsart
File 1: 1.1 version
File 2: 1.0 version
 

A full, originally crafted M.U.G.E.N. tribute game to Vinesauce.  This game features some of the cast members of VHFSMACVUSMRR (Uncle Joel, Bulk Bogan, Dance Master Duane, Jotaro Kujo, DIO, These Pizzas Are In Good Hands, The Bestest Ken, Pepsiman, Tuesday the Tuna, Karnov and Bob Ross), as well as characters released prior to this game's release (Real Police Dude, Sauceboss Vinny and Kazuma Kiryu), in addition to a bunch of new characters.  A few of those new characters have already been uploaded here by @GarfieldfanMUGEN, so thanks, man!
All of the characters in this game have new, refined playstyles, in addition to each having their own V-Trigger.  You may have seen a preview of it in Sauceboss Vinny's moveset.
By Brergrsart
Now has a TV Tropes page: https://tvtropes.org/pmwiki/pmwiki.php/VideoGame/Vargverse

What kind of hero did he grow up to be?
By AGenericDude
2nd file: A.I. patch by coldskin1 (stronger)
 

You sit on a throne of LIES
Based on a SiIvaGunner rip, this character was made as an inside-joke to the community of people that make YTPs in the same style as the rip.  However, the joke fell flat due to how a lot of those videos are now lost media, so this guy got released in July of 2021.
By lau gaming.соm

- Gigguk
By Nep Heart

Just a thicc version of Tic-Tac-Toe, using a certain character from Metal Slug Attack.
The player uses blue spheres and the A.I. uses red spheres.
By MabsKMK
 

All of the characters currently in MUGENMarioWorld, all by xXPGlitz236
Normal characters:
Mario
Luigi
Wario
Waluigi
Toad
Toadette
Boss characters:
Bowser
Special/Guest characters:
Mama Luigi
SMW TV Mario
 
Note(s)
.Defs
The 1.0 def also works for 1.1 (Not modded such as the (In) famous k.y shanxi's SSB Mod)
Do not use the later defs in winmugen. Due to how some pieces of the code is not meant for winmugen. Otherwise it will crash. Use the winmugen def file.
They also come with a readme file (albeit: wordpad): in order to know their specials and supers/hypers.
AI
In order to adjust the ai: Theres 4 options inside their statedef -2.
Main: WinMugen Users has to do that manually.
(1.0 and 1.1 users can either ignore that since it uses the built in options menu for ai difficulty and/or simply modifiy a bit of the AI for something like)
Basic: Often aimed for the simple punching and kicking
Special: Fireball, Uppercut .etc
Super: Super Fireball, .etc
Example: You could have a efficient Usage on Supers. But doesn't combo much
or simply. Wombo Combo and use supers and specials often.
 

Ruby and Yang originally by OHMSBY, Weiss and Blake originally by k6666orochi
The following edits were made:
By Mushypepito123
 

DBZ Extreme Butoden Nappa, in the style of Hyper Dragon Ball Z
By Sky
2nd file: A.I. patch by CSX

By HOTTOMOTTO
2nd file: AI Patch by Nanashi
Quote from White Ranger on Mugen Free For All