Hydra is the leader of the 12 Hellions.
Profession: Being evil
Celestial Race: Hellion
Skin: Dark Brown
Mother: (Find out in Volume 6)
Father: (Find out in Volume 6)
Sister: (Find out in Volume 6)
Daughter: (Find out in Volume 10)
Hydra is evil. Although he was orginally a member of the Delta Clan, he rules over the Delta Clan, Mu Clan and Beta Clan. More is explained about his evil purpose in Volume 5 by Dr. Mihos (you know, the part where the bad guy explains everything to the hero). Pieces of his story can be found in Volume 4 and Volume 6. Although everyone talks about him and is afraid of him, the audience won't meet him until Volume 12.