Jaffar is one of the Deep Six. The Deep Six are a team of six half- humanoid beings from the planet Apokolips who carry out missions of terror and destruction for theri master, Darkseid. They possess superhumsn strength, fish-like scaly skin and fins, and gills that enable them to function under the water. It is not known how long the Deep Six can function out of water.
The Deep Six were all seemingly killed by Orion and the New Gods, but have returned from time to time - meaning they are either difficult to kill or Apokolips has the technology to bring them back to life.