Smoke Choked

Cerberus, aka Kero-chan, from Cardcaptor Sakura!  In M.U.G.E.N., he's a spriteswap of Mattrex by Snowwolf, with buffed stats.  Take this into account, plus his tiny sprites, this makes him hilarious!
By cesarsombra

A glitchy, messed up edit of Muscle Man, similar to various other edits like (r-slur) Luigi.  This Muscle Man may or may not have been made as a hate character.  He uses the character's original moveset, while also summoning the create.swf character that fights with him.  He transforms into random sprites, both distorted Muscle Man sprites and create.swf characters.  In my opinion, he isn't that great, but he is hilarious!
By BeanFan112/Pgrs111MAGEN
 

A superarmored edit of Getsuyoubi, now all rainbowy!
By the Nijikaku team, edited by SSBK65
 

Shrek's gon' give it to ya (what?)
Fuck waiting for you to get it on your own, Shrek's gon' deliver to ya (uh)
Knock knock, open up the door, it's FUCKING SHREK
By MalinRaf1615 & Alberto Grimaldi & Hikaru - Sama
 

By Exclamation_Question
What the hell even is this?

An edit of the Nijikaku yaoi character, Takakazu Abe.
Author unknown
 

Luna Himeki from Vanguard Princess, but she has tons of flashy hypers, superarmor, and plenty more.
By MGST
1st file: Original character, WinMugen only
2nd file: Patch for use in 1.1
 

Nebula, the busty yellow jacket girl, has been updated with brand new sprites!
By LTD911.

Designed from 1.1, a stage based on the arena battles of MK1
By Taybear, with help from oldgamer for the original stage
 

An A.I. patched version of the infamous 300guy, by Halis

A creepy version of Satsuki from Nijikaku
By the Nijikaku team
2nd File: A.I. patch by Lillie's MADs
Quote from Lillie's MADs about the patch
 

A duo of inversions of Mapelao's stages.
By Mapelao, edited by SSBKing 65

Quoted from Yukari Yakumo - Gap Youkai:
By y.y, edited by Yukari Yakumo - Gap Youkai

Ryu with various arranged moves
By Saiai84

A mod for Friday Night Funkin', editing Week 1's music, background, and Dad's model.
Requires a fresh copy of Friday Night Funkin' to play.
By Alexander Cooper 19
 

The titular final boss of Guilty Gear Judgment.
Comes with 1.0 and WinMugen defs.
By kishio, edited by 2OS

From Weegeepedia:
From Russmarrs2 Rise of Sqeegee Wiki:
May or may not be a spriteswap of Shazzo's Bowser, based on the file names?  Perhaps it just uses it as a base.
By Marcio araujo
 

Quote from Gui Santos:
By MAXIMUS & MamboJambo; POTS-ish Style Edit by Magno César + Update by Gui Santos
 

A HD, hand-drawn version of this stage: 
 
Comes with three defs:
CocoHipsHD.def    Normal Coco Moving hips
CocoHipsHD2.def      Inverted colors version.
CocoHipsHD3.def      Transparent version.
By borderoflife

by ZVitor - ReSprite and Edit By Abnerrse4 - Palettes by Yolomate

original AI codes and Hyper Combo Finish sound by Mystik Blaze
Hyper Combo Finish BG sprites by Winane
Edits by Swanky
Changes
- added a hyper combo finish BG, sprites by Winane
- re-enabled her Pushblock. Simple, but effective.
- Captain Marvel learned how to counter. The move is a copy of her QCF K energy blade and is functionally the same.
   It has slow startup but is invincible all the way through. Due to startup it can be blocked.
- Her sHP now wallbounces, if close enough to a wall. This can set up/extend combos that QCF K cannot.
- Her jHP now bounces enemies off the floor. Floor bouncing hight had to be raised to prevent inconsistencies from bouncing.
   You can wall bounce and ground bounce an enemy once each per combo.
- Bolstered the original AvX code a little as a safeguard. The original code has sometimes issues with multiple bounces (especially of the same kind, as I've learned when working on Black Widow)
   - Bouncing height is now -30 due to consistency issues with it when superjumping
   (There may still be some jank left in this)
- Every move that can bounce also has now a secondary hitdef to prevent whiffs due to coding.
   - These moves can now also affect boss type characters. Names for affected characters can be set in Statedef -2.
   - by default, this supports Apocalypse, Onslaught, Master Hand and Abyss per p2name ="x"
- re evaluated basically every damage value in her moveset. Bread&Butter specials are now affected by Damage Dampening, while super moves are not.
- changed her Nova Super to deal damage as a helper, to set the above.
- her QCB P orb special now lasts until it actively hits an enemy or until 5 seconds pass. They no longer vanish when the player is hit.
   - They deal very little damage and hitstun, but they can break enemy combos and reset velocities on your combos.
- checked for consistency on her basics frame data.
- shortened her lie down anim time
- cleared out some twenty PALs or so
- secondary .sff are different sprites. They don't include the new Hyper Combo Finish screens however and will cause errors.
- not sure whether her portrait was there before or whether it is by Shulbocka. Sorry. There's an alternate portrait in the .sff.
- Redid her AI. It's not as good as I want it to be for now since the AI seemingly ignores the variables for bouncing but it just won't spam stuff that the original AvX AI did.
   - The old cmd file with the original AI values is still present, if you so wish.
Changes to gameplay
Captain Marvel now has a lot more options to set up and chain combos. While the initial damage is about average, landing extended combos can put her far above average damage per combo.
As stated, her sHP and jHP now bounce opponents, and one of each can be used per combo, else the opponent will just fall down. Many of her attacks can leave her quite open, so beware.
To compensate, her defensive capabilities are less advanced compared to regular MvC fighters. For instance, she cannot guard push in the air and she has no recovery roll.
However, you can now use her QCB P orbs special to effectively break/reset enemy combos. Depending on hitstun, you may now have a chance to block / counter.
Her extended combo ability is the heart of this edit.
As mentioned she can wallbounce once and groundbounce once per combo. This puts her damage potential through the roof (although there is a damage dampener - I haven't extensively looked for infinites, though).
Here are *some* possible combo chains...
sWP, sMP, sHP
sWP, sMP, sHK, QCF K
sWP, sWK, sMP, sMK, sHK, QCF K -> Wall bounce -> sWP, sMP, sHK, 4,6 HP
sWP, sWK, sMP, sMK, sHK, QCF K -> Wall bounce -> cHP -> jWP, jWK, jMP, jMK, jHP -> Ground Bounce -> sWP, sMP, sHK -> QCF PP
cWK, cMK, cHK, 4,6 HP -> sWP, sMP, sHK, 236 K -> Wall bounce
You should be able to chain together differently as long as you are aware of what bounces you have already used and where the opponent is.

Firebrand, the Red Arremer from Ghosts n Goblins and Gargoyle's Quest, in MVC style
By Acey & Krookodile Belmonth
 

The infamous, buggy version of Foxy, made in the style of Apocalypse.
By Adrian
 

An interesting Super Saiyan God Goku
By MugenMundo

A 2019 April Fool's joke, based on this video 
 
By RedDragonCats17

A World Heroes styled stage based on the Old West.
By Reginukem