Mr. Meeseeks from Rick and Morty is a character that first appeared in relaunch, and was presumably used as a test-bed for new features. Interestingly enough internal documents reveal he was also planned for a scrapped Dead by Daylight-esque mode.
Just like Super Shaggy, CVSShaggy is a character that first appeared in the Season 5 builds of MultiVersus, it acts identical to Shaggy but with a fun spinny hat on-top.
Super Shaggy is a fighter that appeared in the Season 5 builds of MultiVersus, not much is known about him other than it's Shaggy with a Moveset closer resembling one to a certain Saiyan.
Some of these cosmetics are accessible without modifying the game or its files by downloading the following file and putting it in your %appdata%/Local/MultiVersus/Saved/SaveGames folder, this file also allows you to use Cosmetics and Perks again on Characters, on fresh installs of the game.
Showcases Agent Smith transforming from his disguise back into his normal form, this banner uses concept art of Agent Smith.
Heart (Rare)
A simpler version of the Heart Banner, which lacks the white border and three bigger stars which were seen on the original. The Banner appears in the Trigon on the Loose Rift.
IDK, Vampire Stuff (Rare)
A simpler version of the IDK, Vampire Stuff Banner, which lacks bright golden border the original had. The Banner appears in the A FestiVersus Vampire Invasion Rift.
Based on Aquaman and his Pufferfish. Seen used by CPU opponents.
Garnet
Based on Garnet's appearance in Steven Universe: The Movie and Steven Universe Future. Seen used by CPU opponents in online queues.
His Mother's Son
Features Rose Quartz's shield and scabbard on a background of roses, and is the only Profile Icon to not have ever had a DataAsset, being left in the files as a texture.
PFG Tournament Bronze
Features a bronze version of the PFG Guy flying against a dark purple backdrop, surrounded by a bronze border. Seen used by CPU opponents in online queues. This Icon was meant to be given out in a tournament that never happened.
PFG Tournament Gold
Features a gold version of the PFG Guy flying against a dark purple backdrop, surrounded by a bronze border. Seen used by CPU opponents in online queues. This Icon was meant to be given out in a tournament that never happened.
PFG Tournament Silver
Features a silver version of the PFG Guy flying against a dark purple backdrop, surrounded by a bronze border. Seen used by CPU opponents in online queues. This Icon was meant to be given out in a tournament that never happened.
Wonder Woman
The original version of the Princess Diana Icon, meant to be released as its own Icon at a later date, and is noticeably lower quality than the others.
This is a variant of The Power Puff Girls that fits with the Hyper-galactic Puppets line of skins, and is even used in Rifts, the reason why it was left unused is unknown, but it's assumed it's because of readability.
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Giz-snow
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Construction Stripe
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Bombshells Aqua-Man
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Comic Raven
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PlatFight Variants
While all of the PlatFight Variants were added at once, only 4 were released, leaving 4 more unused in the files, despite being finished.
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Sunglasses Variants
Various Fighters post-launch have these variants leftover unused in the files, with most of them being finished.
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Matrix Code Variants
Various Fighters post-launch have these variants leftover unused in the files, with most of them being finished.
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Shark Hat Variants
Various Fighters post-launch have these variants leftover unused in the files, with most of them being finished.
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White T-Shirt Variants
These are presumably templates of the various T-Shirt cosmetics in the final game.
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Pride T-Shirt Variants
These were presumably meant to be released for June 2024, however were not released, Superman is the only one with a unique variant, having a "#1 Dad" on his shirt.
Taunt for Reindog that depicts him getting pet by two floating hands. Seen in the animation demo reel video posted by Dillon Guscott on ArtStation, the assets for this emote still exist in the game files, but no DataAsset exists, and the montage has the hands placed in the wrong spot.
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Kiss
Taunt for the Powerpuff Girls depicting all 3 blowing a kiss, presumably cut due to the Rowdyruff Boys being a skin.
Look at Me!
Taunt for Rick which features him summoning a Mr. Meeseeks which then proceeds to say their iconic "I'm Mr. Meeseeks, look at me!" line and his victory animation is partially based on it.
While Rick was re-animated for full-release, the Meeseeks was not.
Salute
Taunt for Banana Guard that depicts him giving a military salute and accidentally dropping his staff. Shown during his Gameplay Trailer. His victory animation is based on it.
Shake That Ass (Shake That)
Taunt for Rick, based on the dance he does in the episode "Ricksy Business" to the song "Shake That Ass Bitch". First shown in a TikTok video.
In Relaunch, this emotes name was censored to just "Shake That"
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untitled Banana Guard Dance Taunt
Taunt for Banana Guard that depicts him doing a little dance. Shown during his Gameplay Trailer.
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untitled Banana Guard Spear Taunt
Taunt for Banana Guard which depicts him playing with his spear and accidentally hitting his added with it, before noticing the player and assuming a serious position. Seen in the animation demo reel video posted by Superseed Studios on LinkedIn.
Watch me Boogie
A dance emote for Superman, due to an oversight, it looks weird with most of his skins due to him not having glasses.
Badge for scoring points on the stage "The Court"Badge for winning 1v1 matchesBadge for winning 2v1 matchesBadge for winning 1v3 matches (currently only possible in Wacky Weekend)Badge for winning FFA matchesBadge for winning "Best of 3" BracketsBadge for beating "bonus rounds" in the also-unused Guild DungeonsBadge for beating bosses in the also-unused Guild DungeonsBadge for the "Make It Reindog!" challengeBadge for the "Make It Reindog!" challengeBadge for the "Make It Reindog!" challenge
There's a whole smorgasbord of unused stuff relating to rifts, including a lot from when they were still known as "Dungeons".
Icon for Jason's rift, which shows off his placeholder model with red eyes, something that ended up cut from the final model and can be seen in other footageIcon for Jason's riftIcon for Joker's rift, which uses concept art of the key-artIcon for Joker's riftIcon for the Tutorial Rift, showing off a placeholder blockoutIcon for a unknown rift of the "Ruined" variant of TownsvilleIcon for a unknown rift, using concept art of the Titan's TowerIcon for a unknown rift, of the Back to the Past mapImage for a unknown rift, of the Water Tower mapImage for a unknown rift, of the blockout for the unreleased Barbie's Dream House stage
The Dialogue Room is an unused test-bed for the Rift dialogue system, and has Lumpy Space Princess flirting with Batman. There are still images (and scripts) relating to this in the files.
Inside the movies folder is a blockout of the Jason vs. MultiVerse rift intro, showcasing an older version of Jason's model with eyes, and raw voiceovers.