Jaaku

Boss was the leader of the Akutou and the main antagonist of the non-canonical Toonami Total Immersion Event Cosmo Samurai. He was voiced by Jiro Sano.

History
After the death of the Mid Boss, The Mid Boss' eye drone activated and attacked the Cosmo Samurai. It was being controlled remotely by a shadowy figure that revealed himself as the "real" Boss of the Akutou and that the Mid Boss was merely a pawn in his syndicate. He also revealed that he had been watching the entire time and mocked the Cosmo Samurai for their efforts. TOM then declared that the Cosmo Samurai would be coming for him next.