Monster
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Description
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Frowning Gaper

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Walks towards Isaac, dealing contact damage. Upon getting near Isaac, it will open its eyes and pursue Isaac faster. Usually turns into a Pacer or a Gusher upon death.
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Gaper

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Walks towards Isaac, dealing contact damage. Usually turns into a Pacer or a Gusher upon death.
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Gusher

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Walks aimlessly around the room, occasionally firing short-ranged blood shots.
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Pacer

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Walks aimlessly around the room.
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Horf

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Stationary enemy that fires a medium ranged blood shot at Isaac when he gets in range of them.
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Pooter

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Slow-moving fly that occasionally fires single blood shots at Isaac. Does not deal touch damage.
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Super Pooter

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An alternate version of the Pooter that fires 2 shots in a V-formation and does not deal touch damage.
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Clotty

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Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
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Clot

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Randomly wanders around the room, firing 4 tar shots in the ordinal directions.
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I.Blob

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Randomly wanders around the room, firing 8 shots in all directions.
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Mulligan

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Walks around the room, avoiding Isaac. Upon death, spawns several flies, which can be Black Flies, Attack Flies, or Pooters. Can suicide to explode and launch projectiles in the four ordinal directions while still releasing flies.
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Mulligoon

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Walks around the room, avoiding Isaac. Upon death, spawns a Troll Bomb and fires four shots in the ordinal directions. Can suicide to explode, spawn a Troll bomb, and launch projectiles in eight directions.
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Mulliboom

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Chases Isaac and explodes upon death or upon touching Isaac. The explosion deals a half-heart of damage instead of the regular full heart.
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Attack Fly

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Red fly that follows Isaac and deals touch damage.
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Trite

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Quickly leaps towards Isaac and deals touch damage.
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Sack

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Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Occasionally spawns Spiders when fully swollen.
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Slide

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Quickly slides towards Isaac when he gets in its line of sight, then moves slowly back to its original position. Cannot be destroyed.
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Sucker

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Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
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Spit

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Flies slowly towards Isaac, firing an Ipecac shot towards Isaac upon death.
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Embryo

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Aimlessly hops around the room, dealing contact damage.
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Moter

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Follows Isaac, similar to Attack Flies. Splits into 2 Attack Flies upon death.
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Spider

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Erratically moves towards Isaac and deals touch damage.
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Walking Sack

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Does not shrink or regenerate. Walks around aimlessly and occasionally spawns Spiders.
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Big Spider

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Erratically moves towards Isaac and deals touch damage. Splits into two Spiders upon death.
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Nest

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Walks around the room, avoiding Isaac while spawning Spiders. Spawns a Big Spider or a Trite upon death.
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Baby Long Legs

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Runs away from Isaac and frequently spawns Spiders.
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Small Baby Long Legs

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Runs away from Isaac and occasionally spawns Sacks.
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Crazy Long Legs

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Chases Isaac, dealing touch damage. Occasionally stops to spit blood shots in 8 directions.
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Small Crazy Long Legs

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Chases Isaac, dealing touch damage. Occasionally stops to spit blood shots diagonally in 4 directions.
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Fatty

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Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away.
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Pale Fatty

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Slowly walks towards Isaac. Occasionally farts and shoots blood shots in 6 directions. Can turn into a Blubber upon death.
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Blubber

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Walks around aimlessly and randomly spews blood around itself. Can turn into a Half Sack when killed.
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Dip

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Slowly dashes in random directions, dealing contact damage.
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Brownie Corn

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Slowly dashes in random directions, dealing contact damage.
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Wall Hugger

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Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
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Squirt

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Dashes towards the player and deals contact damage. Spawns 2 Dips upon death.
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Ring Fly

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Gathers with any other Ring Flies in the room. These flies orbit around themselves, while following Isaac.
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Skinny

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Slowly walks towards Isaac, leaving short-lasting red creep behind itself.
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Wall Creep

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Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
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Round Worm

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Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
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Ragling

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Quickly leaps towards Isaac and deals touch damage. Randomly shoots two purple shots that orbit around it.
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Psychic Horf

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Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
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Full Fly

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Flies toward Isaac erratically, dealing touch damage. Splits into 6 directional shots upon death.
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Ticking Spider

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Crawls around the room erratically, following Isaac and dealing touch damage. Can jump small distances. Explodes upon death.
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Dart Fly

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Flies towards Isaac and attempts to mimic his movements. Deals contact damage.
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Conjoined Fatty

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Slowly walks towards Isaac. Occasionally pauses to fart out a line of damaging green creep towards Isaac. Chance to turn into a regular Fatty upon death.
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Roundy

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Pops out of the ground in random locations, creating a small rock wave. Fires an explosive Ipecac shot at Isaac if he is in sight.
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Black Globin's Head

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Slides towards Isaac, leaving a trail of damaging red creep.
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Black Globin's Body

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Walks aimlessly around the room, occasionally spawning spiders.
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Swarm Fly

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Follows Isaac in large groups and deals contact damage.
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Mega Clotty

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Slowly moves around the room, occasionally hopping and firing 6 blood shots in all directions. Splits into two Clotties upon death.
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Cyclopia

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Walks towards Isaac, dealing contact damage and leaving behind a trail of damaging red creep. Occasionally shoots a blood shot towards Isaac.
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Ulcer

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Pops out of the ground in random locations and spawns a Dart Fly if Isaac is in sight. Fires a blood shot after spawning 6 Dart Flies.
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Blue Gaper

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Walks towards Isaac, dealing contact damage.
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Greed Gaper

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Walks towards Isaac, dealing contact damage.
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Stoney

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Chases Isaac and blocks tears, but does not deal contact damage. Temporarily pauses in exhaustion after a certain amount of time. Invulnerable; dies when the room is cleared.
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Portal

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Spawns various enemies from the current floor until it either vanishes or is killed.
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