Heitaros was born into a no-name family before rising to prominence among the demon forces. Representing lower demons, he rose to the top of the Demon World without the help of any nobility. After defeating Duel in the Ancient Demon Wars, Heitaros became renowned as the "Demon God" of Elyos. Heitaros, who had earlier invaded the Spirit World, was seen holding the dragon Tiamat by the neck, seemingly already dead, and was awaiting the arrival of their guests, the Grand Chase.