Aku is the main antagonist of Cartoon Network/Adult Swim's 2001 animated fantasy series Samurai Jack. He is a ruthless, diabolical, and manipulative demon sorcerer, who serves as the arch-nemesis of the titular character and the Emperor, as well as the biological father of Ashi and her sisters. In the first four seasons and The Shadow of Aku, he was voiced by the late Mako, who also played Happy Cat in Duck Dodgers and Han Yu Kim in True Crime: Streets of L.A.. In the fifth and final…
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