Intro "Long ago in a distant land, I, Aku, the shape shifting 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."
Type Varies
Proxy Master
Signs of nearing Quotes
Origin Samurai Jack
Map(s) Aku City
Theme song Aku Theme (idle/search/map)
Jack VS Aku (chase)
Partners Aku variants
Smaller versions of Aku (Proxies)
Stunnable? Varies

Aku is a boss in Slender Fortress.


Long ago — very long ago — a single small fragment of an Eldritch Abomination fell to Earth, wiping out the large saurian creatures that dominated the planet at that time. It existed as a mindless evil for millions of years until a brave king attempted to destroy it: the attempt to destroy it instead gave it consciousness. It became Aku, a being of pure darkness and evil. When the samurai who would later be called Jack came to fight him, Aku hurled him into the future as a last-ditch effort to survive. In the future, Aku rules the world, and devotes a lot of effort to finishing Jack once and for all.

In Slender FortressEdit

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Aku has lots of every single types. Despise being a shapeshifter.