Flies
Flies are by far the most common enemy in the game.
Attack Fly
These slowly move towards you with the intention to damage you on contact. They're often accompanied by other flies, but have low health and are more of an anoyance than a threat.
They're found in the Basement, Caves, Depths and Womb.
Black Fly
The Attack Fly's harmless brother. They hover around randomly and deal no damage whatsoever.
They're found on the same floors as an Attack Fly, where they can replace the aforementioned randomly.
Eternal Fly
This little, white fly is only seen circling either an enemy or corned poop. If their host is destroyed, they'll turn into a larger version of the Attack Fly, with more health.
Moter
A Moter is two Attack Flies stuck together. They behave the same, and split into two Attack Flies on death. They can be found in the Caves.
From left to right, an Attack Fly, Black Fly and Moter.
Pooter
Pooters do not deal contact damage. Instead, they fire a single shot at you while slowly moving towards you. They're found in the Basement.
Fat Fly
Somewhat similar to Pooters, these fat ones shoot V-shots while moving away from you. They're found in the Catacombs, but may replace a Pooter in the Basement or Cellar.
Left, a Pooter and right, a Fat Fly.
Boom Fly
Boom Flies fly around the room diagonally, bouncing off walls and other Boom Flies. They explode on death. They're found in the Caves, Catacacombs, Depths and Necropolis.
Red Boom Fly
Identical to Boom Flies, the only difference is that these ones explode in a 6 direction shot. They're found on the same floors as their bomblike counterparts.
Sucker
Suckers slowly fly towards you. Upon death, they explode into a +-pattern projectile shot.
Spit
Similar to Suckers, except that they explode into an Ipecac shot upon death. This shot is targeted either towards you, or another Split. Both Suckers and Spits can be found on every floor.
From left to right, a Boom Fly, Red Boom Fly, Sucker and Spit.
Spiders
Spiders all share the common trait that they move fast and will probably catch new players by surprise.
Spider
If we'd compare all spiders to flies, this would be the Attack Fly. It scuttles around the room, towards you. It can cover large distances in a single scuttle and is often accompanied by others. They're much faster than flies. They can be found in the Cellar, Catacombs, Necropolis, Utero and Chest.
B. Spider
Comparable to a Moter, this spider will split into two normal Spiders upon death. They move somewhat slower and cover less distance in their scuttles than normal Spiders. They can be found on the same floors where Spiders can be found - the Cellar, Catacombs, Necropolis and Utero.
Trite
This spider will jump from place to place, able to cover the entire length of a room in one hop.
They're comparable to Flaming Hoppers, or to a lesser extent, their normal counterpart, the Hopper. They can be found on the same floors where Spiders and B. Spiders can be found, except for Utero.
On left is a Spider and a B. Spider, on the right a Trite.
Turrets
There are two types of Turrets, both of which have the same three versions.
Stationary turrets will shrink when damaged. They can only fire when at full size, and, if left alone will slowly regrow to full size. They don't deal contact damage.
Walking turrets don't shrink and have a finite amount of health instead. They fire more frequently and aimlessly walk around the room.
Boil (Stationary)
The most common and, in my own opinion, most dangerous. That's because the shots they fire are random and scattered. They're found in the Caves, Catacombs, Depths and Necropolis.
Gut
Not to be confused with the enemy called Guts, these green versions of the boil shoot Ipecac shots, aimed at you, instead. They're found on the same floors as Boils.
Sack
The white Sack spawns Spiders instead of shooting and can be found in the Cellar, Caves, Catacombs, Depths and Necropolis.
Walking Versions
Walking versions are identical to their stationary counterparts, except for the differences explained before.
From left to right in the top row, Boils, a Gut and a Sack. And in the bottom row their walking counterparts.
Bestiary - Common Enemies #2
Deformed Humanoids
These, except for the Mulliboom, could be seen as the different stages of having an infestation of flies. It's not uncommon for any of these to suicide.
Mulligan
A harmless enemy that tries to flee from you. It can neither attack nor deal contact damage and spawns several Black Flies upon death. Mulligans can be found in the Basement, Cellar, Caves and Catacombs.
Mulligoon
Mulligoons will try to flee from you too, and don't deal contact damage either. They do have an attack though, which is to suicide and explode in a 6-projectile shot while dropping a Troll Bomb. If you kill them before they can kill themself, they'll explode in a +-patterned shot, instead.
They can be found in the Basement, Cellar, Caves and Catacombs.
Mulliboom
This version will run towards you immediatly, exploding on contact. They're considerably faster than their cowardly brothers. Luckily, their explosion only does half a heart of damage. if you kill them yourself, they'll, obviously, explode too. Like Boom Flies. They can be found on the same floors as their counterparts above.
Hive
Much like Mulligans and Mulligoons, these poor enemies will try to run away from you as you slaughter them. They do have an attack though - If you are in their line of sight, they'll cough up flies. (Usually Attack or Black Flies). On death, they spawn up to 5 flies, composed out of Attack / Black Flies, Pooters and Fat Flies, randomly. They can be found in the Caves, Catacombs, Depths and Necropolis.
Swarmer
Slowly hovering around the room, these abominations will randomly spawn regular Attack Flies. Whenever hit, they will spawn flies more frequently, and Pooters or Fat Flies instead of Attack Flies. Upon death, they live either a Boom or Red Boom Fly in their wake.
Swarmers are immune to contact damage, such as from the Virus, but also doesn't deal contact damage itself. They're commonly found in Necropolis, and to a much lesser extent in the Caves, Catacombs and Depths.
Mulligan; Mulligoon; Mulliboom; Hive and Swarmer, in that order.
Bestiary - Common Enemies #3
Humans (Or humanlike)
May include deformations.
Hopper
These enemies will randomly jump around the room. If you get close though, they'll jump towards you. They can be found in the Basement and Caves, and can only damage by contact.
F. Hopper
If a Hopper touches a fire, it will turn into an F(laming) Hopper. These versions are quicker, cover more distance with their jumps and have double their original health. They are never found 'naturally'.
Leaper
The Hopper's more dangerous brother, Leapers will act like Hoppers but occasionally jump up very high (off the screen) and land on your current position, firing shots in a +-pattern as they land. They're found in the Caves and Depths.
Gaper
Gapers will walk towards you in the most direct route available. They can only damage by contact and upon death may leave either a Pacer or Gusher in their wake. They're found in the Basement and Cellar.
Pacer
Pacers aimlessly walk around the room, they're found in the Basement and Cellar.
Gusher
A Gusher is similar to a Pacer, except they'll occasionally fire aimless shots from their neck.
They're found on the same floors.
Gurgle
They behave similar to Gapers, except that they're slower and shoot Ipecac projectiles at you. They're found in the Catacombs and Necropolis.
From left to right, a Hopper (and a green Champion), Flaming Hopper, Gaper, Pacer, Gusher and Gurgle.
Mr. Maw
These enemies will walk towards you and launch their heads at you. The heads will still be connected to their body via a long cord. On death, they may leave either a Maw or Pacer in their wake. They're found in the Depths and Necropolis
Maw
A flying, severed head that will float towards you and shoot projectiles. They're found in the Caves, Catacombs, Depths and Necropolis.
Red Maw
Floats towards you faster than regular Maws and does not shoot, instead, explodes in a +-pattern of projectiles upon death. Like normal Maws, they can be found in the Caves, Catacombs, Depths and Necropolis.
Psychic Maw
A very rare version of the Maw, they behave like regular ones, except that they shoot homing shots instead of regular ones, and have an Eternal Fly circling them.
Horf
Horfs are a lot like Maws, except they don't float towards you. Instead, they stay immobile while firing at you. They're found in the Basement.
From left to right, Mr. Maw, Maw, Red Maw, Psychic Maw, Horf, and a Mr. Maw showing its attack.
Bestiary - Common Enemies #4
Regenerating Creatures (Humanoids)
Creatures, apart from the stationary Turrets, that can regenerate indefinitely.
Globin
This enemy will walk towards you, much like Gapers. Will do a full heart of damage on contact, and, once defeaten will turn into a pile of goo. Unless this pile is destroyed, a weaker version will regenerate from it. They're found in the Caves, Catacombs, Depths, Necropolis, Womb, Utero and Sheol.
Glazin Globin
This enemy behaves like a Globin does. Compared, it has a higher movement speed, health and once turned into goo will slide away from you. They appear naturally in the Depths, but may replace a Globin on any floor.
Left, a Globin and right, a Glazin Globin.
(Semi-)Invincible Enemies
Enemies that are either invincible, or invincible under special occasions.
Does not include the Grimaces, Poky or Slide, which are explained under Environments - Leftovers and Environments - Spikes.
Knight
Knights are invincible up front and can only be damaged from behind. They generally move around the room randomly, but once they notice you - be it in their line of sight or just being close in general - they will move towards you with increased speed. They're found in the Caves, Depths, Womb and Sheol.
Selfless Knight
These enemies behave just like Knights, except they'll move towards you at a higher speed if detected. They're found naturally in Sheol, but may replace a standard Knight on any of their floors.
Left, a Knight and right, a Selfless Knight.
Mask + Heart
While a Heart may appear alone, a Mask is always accompanied by a Heart. A mask functions like a Selfless Knight, except it's completely invulnerable. The only way to kill a Mask is by destroying its coupled Heart. Mask + Heart pairs are found in Utero and Necropolis.
Heart
A heart, wether or not coupled with a Mask, will slowly try to move away from you and, when you get to close, shoot out projectiles in a +-pattern. They can be found in Utero and Necropolis when paired with a Mask, or alone in the Womb and Utero.
Left, a Mask + Heart pair and right, a single Heart.
Host
Hosts are immobile skulls that reveal a flesh body once they rise up to shoot you. They fire triple shots, and only rise up when not under fire. The skulls cannot be damaged. They're found in the Caves, Depths, Womb and Sheol.
Red Host
Not invincible or invulnerable in any way, the Red Host is much like its counterpart. No longer invulnerable with its skull down, it rises up much more frequently to fire shots of 5 tears at you.
From left to right, a standard Host, a standard Host revealing its flesh body, a Red Host and a Red Host revealing its flesh body.
Bestiary - Common Enemies #5
Blobs
Because really, what else could I call them?
Clotty
Clotties slowly crawl (if you can call it that) around in random directions, occasionally shooting projectiles in a +-pattern. They're findable on every floor.
Clot
Clots are a lot like Clotties, except they shoot projectiles in an X-pattern. They're findable on the Basement, Cellar, Caves, Depths, Catacombs, Utero and Cathedral.
I. Blob
A rare enemy, kind of a combination of the Clot and Clotty. It behaves the same except it shoots out a + and an X-pattern at the same time, and more frequently. It can replace either a Clot or Clotty on their floors.
From left to right, a Clotty, Clot and I. Blob.
Maggots
Because even though one is actually called Maggot, that's what they all are.
Maggot
This enemy moves around the room aimlessly, only being able to damage via contact. It's findable in the Caves and Catacombs.
Charger
They behave just like Maggots until you get in their line of sight, in which case they'll charge towards you with increased speed. They're findable in the Caves, Catacombs and Depths.
Spitty
Spitties will, also, aimlessly move around the room. Sometimes they'll randomly shoot a projectile forwards. They're findable on the same floors as a Charger.
From left to right, a Maggot, Charger and a Spitty.
Bodyparts
Because that's what they are.
Brain
Slowly slides around the room, leaving a trail of red creep. This enemy's present in the Depths and Womb.
Guts
Rolls around the room, connected to a rock, spikes or a wall. If the object they're attached to is broken, they'll quickly attach themself to another one and continue rolling. Just like Brains, they're present in the Depths and Womb.
MemBrain
MemBrain slowly moves around the room, occasionally hopping up to fire 8 large projectiles in a circle around itself. Upon death, will leave two Brains in its wake. Findable in the Depths, Womb, Utero and Chest.
Mama Guts
Functions the same as a Membrain, except it leaves two Guts in its place upon death. Finable in Necropolis and Utero.
From left to right in the upper row, a Brain and Guts. And in the bottom row MemBrain and Mama Guts.
Bestiary - Common Enemies #6
B. Lickers
Because I had no idea where else to put them.
The B. Licker will move around the room randomly, aimlessly and quickly. Usually found in lines of 5 or 3 parts. Killing one part of the line will make them all seperate. They may bump into poop or TNT-barrels, destroying them. They're found on the Catacombs, Utero and Necropolis.
Burrowing Enemies
Enemies that are encountered only on the Womb or Utero and use its fleshy floor to burrow under.
Para-Bite
These Diglets will move towards you and often burrow underground to move away from you again. Can only damage on contact.
Fred
These creatures, of whom I can only assume they were named after a friend of the developer or something, can fire an Ipecac-shot at you before jumping up to burrow down, to reappear somewhere else. When burrowing down, they release projectiles in an X-pattern.
Lump
I've always called them Cysts. Anyway, it fires a triple shot at you if they see you. Will run away after shooting them, via burrowing.
From left to right, a Para-Bite, Fred and two Lumps.
Leeches
They don't suck blood, don't worry.
Leech
Behaves like a Charger, except it can fly. Findable in the Depths, Womb and Utero.
Kamikaze Leech
Also known as Bomb Leech, it behaves like a standard Leech except it explodes on death. It's findable in the Depths, Womb, Utero and Sheol.
Holy Leech
Also known as the Holy Bomb Leech, it behaves exactly like a Kamikaze Leech, except it has an Eternal Fly circling it. Findable on the same floors as the Kamikaze version, plus the Cathedral.
From left to right, a standard Leech, Bomb Leech and a Holy Leech.
Vis
Or would the plural be Visses? Visii? Visaea?
Vis
This enemy will charge up, and fire, a Brimstone-like laser once you're in their line of sight. Apart from that, they walk around slowly and randomly in the room. They're findable in the Depths and Womb.
Double Vis
This enemy functions like a normal Vis except it also shoots a laser out the back. They're findable in the Depths, Necropolis and Womb.
Chubber
Chubbers fire off a Little Chubby-like familar, or a Charger that can fly. Apart from that they function the same as a normal Vis and are findable in the Catacombs, Depths, Womb and Necropolis.
From left to right, a Vis, Double Vis and three Chubbers.
Mirror Movers
You'll understand why.
Dople
This enemy mirrors your movement completely. It only fires when you do, and has the same range and fire rate as you do, too. They don't deal damage on contact, though. Dople is findable in the Womb and Utero.
Evil Twin
While it's supposed to be an upgraded version of Dople, it's actually even easier to kill. It mirrors your movements and shoots when you do, but, it will always shoot a triple projectile that moves much slower than yours. Note that it can fly, though. You can find your Evil Twin most commonly in Sheol, although they might appear in the Womb and Utero, replacing a Dople, too.
A Dople on the left and an Evil Twin on the right.
Bestiary - Common Enemies #7
Eyes. Stationary turrets.
Eye
The immobile Eye will function like a stationary turret but is much more dangerous than others I've called Turrets, such as the Boil, Gut or Sack. An eye will track you and fire a Technology-like laser at you in quick succession. They're only findable in the Womb and Utero.
Bloodshot Eye
if you're wondering why it's called Bloodshot, that's because the Brimstone-like laser it fires, as opposed to a Technology-like laser, is also known as Blood laser. Anyway, this version of the Eye tracks somewhat faster and fires faster too. Paired with the thicker laser it fires, it's quite dangerous. It can be found naturally in Sheol but may replace a normal Eye in the Womb or Utero.
I spy with my little eye an Eye on the left, and a Bloodshot Eye on the right.
Baby
You.
Baby
These flying enemies fire a single shot at you whilst slowly hovering towards you . Occasionally, they may teleport away from you. They're findable in the Depths, Necropolis, Womb and Utero.
Angel(ic) Baby
Angel Babies are much more agressive than their non-winged brothers, blessed with much more health, they shoot triple shots while hovering in on you. They'll teleport more frequently too, but to get closer to you instead of running away. They're findable on the same floors as the standard Baby, plus the Cathedral.
Baby on the left, Angel Baby on the right.
Thiefs
If they hit you, you lose ánd drop some coins.
Keeper
Also known as Greed Heads, these nasty enemies will hop around the room while firing V-shots at you. They'll usually try to hop into you to deal damage, too. They're seen in the Catacombs and Necropolis.
Hanger
Hangers float around the room, slowly towards you as they fire triple shots. The Hanger is immune to touch-damage and doesn't inflict it itself either. They always have an Eternal Fly circling them, and they're hangin' out in the Catacombs, Necropolis and Cathedral.
A Keeper on the left and on the right, a Hanger.
