Fairy Leviathan, known in the Japanese version as Siren General Leviathan, or simply Leviathan, is a member of the Four Guardians of Neo Arcadia in the Mega Man Zero series. She was created from X's DNA data after the Maverick Wars to clean the world's oceans. Leviathan's schematics are based off X's capabilites of underwater combat. Some time later, she became a military general of Neo Arcadia, commanding the Deep Sea Squadron, Neo Arcadia's navy force. she makes an appearance in Mega Man ZX and Mega Man ZX Advent as Biometal Model L.