Fatty

Bubbles
Bubbles are slightly bloated Fatties. They slowly walk towards Isaac, occasionally firing a tear at Isaac when damaged. They sometimes pause and fart, knocking back Isaac and other monsters, together with shooting a rapid burst of tears in random directions, each with a random range. Upon death, Bubbles bursts into a fountain of tears that rain down for several seconds.

Quakey
The Quakey is a stone covered Fatty. It slowly walks towards Isaac. Sometimes it may leap a short distance. Upon landing, Isaac is knocked back, a ring of 8 rocks spreads from where it lands, and rocks will randomly fall from the ceiling.

Big Bony
The Big Bony is a skeletal Fatty. It slowly walks towards Isaac. It occasionally fires a large explosive bone which creates rock waves near its point of impact.

Barfy
The Barfy is a zombie Fatty. They slowly pace towards Isaac. They occasionally spew clusters of green shots towards Isaac, which leave puddles of damaging green creep.

Vessel
The Vessel is a monstrous maggot-infested Fatty. It strolls towards Isaac, spawning a Small Maggot when it takes damage. Occasionally it stops to spew out even more Small Maggots along side an irregular puddle of damaging green creep around itself. Upon death it explodes into multiple Small Maggots.