His appearance resembles a large flying-lion type monster, with an scale-armored back and both dragon tail and wings. He also has red demonic eyes.
Story
In Dragon Quest IX it is revealed, thank to Fowleye, that the Nemean is one of the ten monsters that were created by Zenus remains (due to Corvus' attack) and also that the draconic lion used to be His "harebrained" head and in the Monster List is also revealed that "he could speak the mortal tongue, but had long forgotten".
This ultimate being combines the best of nature's creations, and its heavenly form has earned it the nickname 'Godbeloved'. It was once able to speak the mortal tongue, but has forgotten both that and its true form in its long years of captivity.