Pandora

Pandora is the master of depression and the most loyal subject to Hades. She existed during the time of the ancient greeks and was cursed with immortality, and eternal youth, to always fight for Hades. The spread of darkness came from the infamous pandora's box, which is how she has become who she is today.

History
Pandora was once a kind, and loving young girl who always think of others, but afther discovering an ancient box, and releasing the evil into the world, she cursed and banished from her home and family to serve Hades forever.

Trivia

 * Pandora will try and trick the Miztyk Knights into fighting for Hades in The Hades Chapter of Aaron's Adventures in Saint Seiya.
 * Pandora and Hades are both Brother and Sister.