Here's an update of an old public domain character:
Charles Forbes was born into wealth. He had it all, but always wanted more. He owned an extremely valuable blue diamond, and decided to steal it from himself, and collect the insurance money (and sell the diamond off in secret on the black market). To do this, he created the identity of The Green Mummy (as he had a fascination with Ancient Egypt). He was foiled by The Black Owl, and ended up in prison.
While incarcerated, he met Professor Vatz, who was the Lash Lightning enemy known as The Mummy. Vatz had developed a paint made from Radium that when applied to the wrappings he wore, made him immune to all common weapons (in essence, making him invulnerable). He also developed a "hotlight" gun, which not only blinded his foes, but caused them to become disoriented and dizzy. Forbes and Vatz were cell mates for a time, and the two made plans to work together once they got out (and get revenge on the heroes who defeated them).
Those plans never came to fruition. Vatz was broken out of prison by Mastermind (another enemy of Lash Lightning), who wanted the secret of his radium paint. Vatz never told him, so Mastermind killed him.
When Mastermind broke Vatz out of prison, Forbes also escaped. He went to a hideout Vatz had, and found his notes for both his Hotlight Gun and Radium Paint. Recreating both with the aid of Crimesmith, he decided to modify his villainous alter-ego. Tapping more into his fascination with Ancient Egypt, he saw himself now as a Pharaoh of old. No longer was he the Green Mummy; now he was The Jade Pharoah, the ruler of crime!
