this little guy i posted before, 
is a fatty. he hasnt been implemented yet, but hes a harder but slower version of the basic isaac enemy from the 1st level and will appear in ch2.
hes another “modular” enemy that has a % chance of turning into another enemy when he dies. i really liked that about the gapers so i wanted to do it again with a harder enemy on a later level. so i wont spoil how they attack and move differently but i will say that when you kill the fat sack it has a % chance of becoming a “blubber” and that the blubber has a % of turning into a half sack..