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Ghast was a demon in Tartarus.
Ghast was seen in Tartarus, laughing as he watched his brothers Abnegazar and Rath fight over a bit of meat left on a bone, when suddenly Abnegazar was snatched away by Wonder Woman and Hawkgirl to aid in their search for Felix Faust.
The depicted subject bears the likeness of Ghast from the DC Comics; however, the DCAU character was never named on-screen, or otherwise. The title of this article is conjecture based on the character's likeness.
Rath, along with his brothers Abnegazar and Rast, are known as The Demons Three in DC comics. The Demons Three ruled the galaxy a billion years ago, and have often been summoned by and connected with Felix Faust.