Gargoyle is the main antagonist in Nadia: The Secret of Blue Water. He considers himself an Atlantean, but he is not aware of the fact that he is one of the humans that he despises, as the mere creation of the Atlantean technology. He is a cunning yet brutal villain who speaks in a soft voice and taps into other people's weaknesses to make them comply with his wishes. We never see the face behind the mask until the final episode (and even then, his face is only briefly shown before he dies).
His name is also a mix of Latin and Greek mythology, as for Nemo and Electra. In first Italian dub. he's called Argo.
He is the new leader of The Scourge.