"You think you are ready to challenge me? The last time you tried it I spared your life. This time I may not be so merciful."
—Aku warning Sarpedon.[src]

Aku was a Celerity Demon and mentor to Sarpedon, whom he taught of the upcoming threat of Avatars. He fought his pupil to determine his strength and was subsequently vanquished by him.


Searching for the Potions


Aku with Kazl and Zyke.

In 1981, Aku attempted to obtain some ancient potions with two other demons, leading to the deaths of Jack and Ruth Brody. This left Kyle Brody an orphan and triggered his vendetta against the Avatars, whom he believed responsible for the attack.

Fighting his Pupil

At some point in time, Aku mentored Sarpedon and taught him about the threat of the Avatars. In 2004, his pupil started collecting guardian angels to make himself stronger and fight the arrival of the Avatars. He challenged Aku to a fight and lost, after which he obtained the angel guarding Paige Matthews.

Sarpedon fought his mentor again and wounded him. Aku then congratulated him and hoped the angels were enough to protect him against the Avatars. Sarpedon then thanked him and vanquished him with an energy ball.

Powers and Abilities

Active Powers
  • Smoking: The ability to teleport through smoke.
  • Hyper Speed: The ability to move at super speed.
  • Super Strength: The ability to possess strength beyond humanly possible.
  • Energy Ball: The ability to throw spheres of energy that resemble electrical discharges.
  • Fireball: The ability to throw spheres of fire.
  • Summoning: The ability to draw or transport a being or objects to the user.
Other Powers
  • Immortality: The ability to possess an infinite lifespan and an arrested aging process.
  • High Resistance: The ability to be highly resistant to physical and magical harm.

Notes and Trivia


Aku appeared in a total of 2 episodes over the course of the series.

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