Dhuran is the leader an the toughest of the four Dread Fiends, and a major villain of Dragon Quest VI. He's a red humanoid demon who wears a cape, shoulderpads and a helmet and uses a sword-like weapon to attack.
Despite being a Dread Fiend, Dhuran is quite honorable and only desires to cross blades with the Hero after he proves his worth by finding the legendary equipment and emerge victorious in other two battles he prepares for him. He even heals the Hero and his party before fighting them. After he's defeated he acknowledges the hero's power and commends and his friends for the hardships they conquered revealing the identity of Mortamor and his plans and releasing Terry from his spell.
In Dragon Quest Monsters, he's the main antagonist and the mind that sent Terry on his journey while creating the dark adult form of Terry as well.
Dragon Quest I