Samurai Jack AKU Mask

"Long ago in a distant land, I, Aku, the Shapeshifting Master of Darkness, unleashed an unspeakable evil.
But a foolish samurai warrior wielding a magic sword stepped forth to oppose me.
Before the final blow was struck, I tore open a portal in time, and flung him into the future where my evil is law.
Now the fool seeks to return to the past and undo the future that is Aku."

Aku is the main antagonist of the series Samurai Jack. Born from The Black Mass of Darkness, Aku was an evil, shape-shifting demon who took over the world and ruled it for countless eons, the arch-nemesis of Samurai Jack and the biological father of Ashi and her twin sisters. Throughout seasons 1-4, Aku was voiced by Mako Iwamatsu, but due to Mako's death in 2006, Aku was voiced by Greg Baldwin in Season 5.

Though Aku was capable of shifting his form into virtually anything that he wished due to his metamorphic body, his standard form after he self-upgraded and adapted to the Earth was roughly a humanoid b