One of the three students of the great Magus Noah, Master Doga was given the power of magic. A recluse, he lives in a manor secluded from the rest of the world protected by powerful winds, with moogles as his guards. He joins the heroes when he enters the Cave of the Circle with them. The Warriors of the Light travel through the Cave of the Circle in order to make the Nautilus submersible and then so they can enter the Temple of Time and ultimately awake Unei.
As a supporting character, he sometimes casts either Flare or Firaga at the start of a battle.
He later goes to another dimension to find the key to the Forbidden Land, Eureka. He is not heard from again until he contacts Master Unei in the world of dreams. Eventually he contacts her again after the heroes get the Invincible to come to the other dimension. The heroes later have to fight him in Doga's Grotto where he turns into a horrible, tailed, inhuman head. The heroes must battle Doga and Unei as the Eureka Key needs energy from them before it can be used. After the party defeats him, Doga reassures the party that though his body is destroyed, his spirit will live on and gives them the complete Eureka Key.
Before fading away Doga commands the party to travel to Syrcus Tower and defeat Xande. He tells them that this will banish darkness from the world.
When the party is defeated by the Cloud of Darkness, it is Master Doga, along with Master Unei, who revives them. After doing so, their spirits move on for good.