| Reaper |
Picture by FlashMasterXD.
A little fly with a blue ball under its body, can be found in The Depths, Necropolis, Womb or Utero. Very similar to Sucker or Puffer. It slowly follows you. When you kill it, it sends blue technology laser in horizontal and vertical directions. It has more HP than Sucker and Puffer. They appear as an enemy you fight when Little Ghost is killed.
Pooter flies that fire out green bombs instead of red bullets.