He's known by many names that relates destruction, but the most common nickname is "Doom" and he's one of the three brothers of judgement.

Doom is a pure sadistic being whom enjoys cause destruction and suffering upon people, both physically and mentally. He always bears a devilish grin with a blazing cigar between his fangs. Though his species is alligator, his ablilities and size are nowhere NEAR natural...

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This is the final design of him. Though I believe the pants needs more work, the rest of him seems pretty OK to me.