Hydra is a demon, a god of death and fire and the seventh recruited member of the Hall of Injustice. He's from the Death Realm of the North Pole and he's the archnemesis of Rudolph and the other Flyers. He's over 900 years old, 9 feet tall and weighs 300 pounds. He has teal-gray skin with a thin head and chin, gray flames on the top of his head, long fingers, timber gray lips, an elongated mouth, sharp yellow teeth and his eyes are outlined with red with yellow sclera and small black pupils. He has dark gray circle markings around his eyes. He wears the same clothing and wings of Ryuk from Death Note and he has the same voice of Hades from Hercules (1997). He's very fast-talking, comical, murderous, violent, overenthusiastic, short-tempered, calm, crazy and jokey. He is known to be responsible for the murder of Mitzi, who is Rudolph's beloved mother and other deaths or murders in huge massive destruction in the WCK caused by him and his spirits. He is also known as the Spiritual God Master of Death and Fire or the Grim Reaper of the WCK. He owns an army of dark spirits and demons. He possesses flight, superhuman strength, durability, stamina, speed, agility, endurance, reflexes, senses, stealth, jumping/leaping, and longevity, night/electromagnetic/telescopic/microscopic/
infrared vision, gray flaming breath, invincibility, immortality, pyrokinesis, necrokinesis, umbrakinesis, typhokinesis, precognition, necromancy, teleportation, and space-survivability. He's mastered in scythemanship, hand-to-hand combat and martial arts. He owns a double-bladed scythe. He appears to be close friends with Scarlet and one of the three most powerful members of the Hall of Injustice, along with Scarlet and a certain someone.