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Dark Opal is a supervillain that works with Eclipso.
Dark Opal is a tall muscular man, with pale blue skin featuring stress marks, long black hair and a black moustache and beard ensemble. He has black eyes and wears a dark blue and purple jump suit, featuring purple stripes criss-crossing at the bottom, a pale pink diamond on his chest and the same purple stripes on his arms, with dark blue pants. He's also wearing a magenta coloured cape, with a skull badge holding it on.
His voiced by Sean Schemmel in the English version of the cartoon.
He appears fighting Wonder Woman in the Super Hero High courtyard and later fighting Katana in a jungle like environment.