Yeast

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In the files, a folder named yeast can be found. It contains a huge collection of various enemy and boss ideas. These ideas merely exist as sprites or drawings, and while not currently planned to be added, that does not mean some ideas will never be added.

The following are almost all of the images that can be found inside the folder:

Sprites

Agateway

Agateway.png

This enemy actually has an entire animation file that shows us that this enemy would have been able to teleport around the room.

Amfy

Amfy.png

Angler

Angler.png

Not to be confused by the unused enemy with the same name.

Ballooner

Ballooner.png

What seems to be a womb variant of a Melty.

Baloon

Baloon.png

Bang

Bang.png

Battering

Battering.png

Blaster Knight

Blaster Knight.png

This variant of Knights, according to its spritesheet, was supposed to launch its brain, probably aiming at the player, similar to how Chaser does it.

Bloodin

Bloodin.png

Bony Balor

Bony balor.png

Bony Morsel

Bony morsel.png

Bony Worms

Bony worms.png

Bore

Bore.png

An unknown enemy with an unfinished sprite.

Buff Ghost

Buff ghost.png

A pair of enemies that, according to concept art, would have the left one be sent out by the right one in order to rapidly punch Isaac.

Butt Grimace

Buttgrimace.png

A Grimace variant that would probably release poison gas clouds similarly to Gasbag.

Cadre

Cadre.png

Cadre resembles a Grub or Larry Jr. made out of Globins. It probably would have Grub's AI and it would split into Globins and Gazing Globins, similarly to Globscraper, upon death. It is assumed Cadre would be found mostly in chapter 4.

Cannonball

Cannonball.png

A pair of enemies with unknown behavior. It is possible that the enemy on the right launched the enemy on the left at the player.

Chaff

Chaff.png

Charcoal

Charcoalnew.png Charcoalold.png

Chomp

Chomp.png

Chomp seems to be an early version of the Gamper, with both clearly resembling the Chain-Chomp enemy from Mario.

Daddy Haunt

Daddyhaunt.png

Dandruff

Dandruff.png

Decoy Boy

Decoy boy.png

Devious Dip

Devious dip.png

Dimwit

Dimwit.png

An unknown enemy. Its body sprites may have been modified and reused for the Missing Link.

Double Crosser

Doublecrosser.png

What seems to be a holy variant of Woodburner.

Dust Bunnies

Dust bunnies.png

Enemies that appear similar to the ones found in Super Meat Boy.

Edmund Sketch

Edmund sketch.png

Egg Practice

Egg practice.png

Explode Forever

Explodeforever.png

Eyesore

Eyesore yeast.png

Fat

Fat.png

Fistula Boys

Fistula boys.png

Fun Guy

Monster funguy.png

Geomancer

Geomancer.png

Glimdark

Glimdark.png

Gnaw

Gnaw.png

Goat Boy

Goat boy.png

Greed

Greed boys.png

A few greed-themed enemies, possibly meant to be enemy reskins for Greed Mode.

Guy

Guy.png

Headcase

Headcase.png

What seems to be a tainted Mr. Horf.

Heartbeat

Heartbeat yeast.png

What looks like a fatty verson of Punted.

Hells Janitor

Hells janitor.png

Home

Home.png

Homing Priest

Homing priest.png

Hydro Knight

Hydro knight.png

A Knight variant which, judging by the name, would appear in either Downpour or Flooded Caves.

IQ Baby

Iq baby.png

Jelly Shroom

Jellyshroom.png

Knife Brim

Knifebrim.png

A Vis variant that would possibly function like the synergy of Mom's Knife and Brimstone.

Knight Slammer

Knight slammer.png

Possibly an earlier version of the Thwammy due to its size.

Liberty

Liberty.png

Lil Jugg

Lil jugg.png

Loomer

Loomer.png

An enemy that looks like it would have appeared in Gehenna. It also bears a resemblance to Hangman.

Max

Max.png

Meaty Bone

Meaty Bone.png

An enemy that looks like a floating Clotty or Meatwad.

Megaton

Megaton.png

A bigger version of the earlier Bang.

Mistmonger Hard Mode

MistmongerHardMode.png

Judging by the name, this enemy would have probably been a tainted, or at least harder, version of the Mistmonger.

Mutant Hive

Mutant hive.png

Necro

Necro Yeast.png

Oracle Box

Oracle box.png

An enemy that might have appeared in Psionic Sheol.

Paunch

Boss paunch.png

What appears to be a boss version of Roly Polies.

Poop Globin

Poop globin.png

Popcorn Fly

Popcorn fly.png

Popup Gaper

Popup gaper.png

Potato Bag

Potato bag.png

Preserver

Preserver.png

Quickerspirit

Quickerspirit.png

Based off the enemy's name, would've most likely made other enemies faster.

Receptor

Receptor.png

Red Squirt

Red squirt.png

Possibly an early version of the Berry enemy.

Revelations Snaggers

Revsnag.png

Enemies that look like Snagger variants which would likely appear on the Revelations floors Glacier and Tomb.

Ringer

Ringer.png

Robunculus

Robunculus.png

Sausage Roll

SausageRoll.png

An enemy that seems to be a Roly Poly variant of the Fistuloid.

Seared Gaper

Searedgaper.png

A Gaper variant that might have appeared in Smoky Burning Basement.

Shark Worm

Shark Worm Attack.gif

An enemy that might have appeared in either Downpour or Flooded Caves, the latter being more likely.

Sirloin

Sirloin.png

Snarler

Snarler.png

Spider Turret

Spider turret.png

Sporax

Sporax.png

Spore Cannon

Spore turret.png

Squeaky

Squeaky.png

Squeaky is what seems to be an early version of Sponge.

Stitch

Stitch.png

Submariner

Submariner.png

An enemy that might have appeared in either Downpour or Flooded Caves; they have several skins, suggesting they might have appeared in both.

Tender Loin

Tenderloin.png

A smaller version of the above Sirloins.

Tetris

Tetris.png

An I, O, L, and S block made from Wimpies, the bottom wimpies resembling Stompies.

Tishooter

Tishooter.png

Vom

Vom.png

Wet

Wet.png

Two enemies that may have been earlier versions of the Mayfly and Mightfly.

Wrinkly

Wrinkly.png

A very strange enemy that may have appeared in Scarred Womb.

Drawings

Ashen Bony

Ashenbony.jpg

Big Burbly

Bigburbly.jpg

Braniac

Braniac.png

Big Braniac.gif

What was originally a mobile version of Glass Eye.

Brander

Brander.jpg

Gulper

Gulper.png

A Cellar boss concept.

Crimson Court

Crimsoncourt.jpg

Deep Dweller

Deepdweller.jpg

Duke of Hazards

Dukeofhazards.png

Fistulo

Fistulo.jpg

Gump

Gump.png

Inkert

Inkert.png

Matriarch Glitch

Matriarchglitch.jpg

Mine Worm

Mineworm.jpg

Mor-tar

Mor-tar.jpg

Not Kingpin

Notkingpin.jpg

Possibly an older version of Buck, whose name would have originally been 'Kingpin'.

Oldest Concepts

Oldestconcepts.jpg

A bunch of drawings of early FF enemy concepts, including some which have never been seen.

Painter

Painter.jpg

Slammo

Slammo.jpg

Possibly meant to be the boss version of a Slammer.

Succubus

Succubus concept.png

Targeists

Targeists.jpg

Zombie Air Unit

Zombie air unit.jpg

An enemy that, according to the Devs[1], was 'pitched seriously' at one point. Its behavior is unknown.

References