Genpei Oono is antagonist for the Extended arc. He tried to hide his crime of killing Keiko Kikuchi by potraying it as a work of Gravedigger.

Welcome to Kura, an organization that investigates crime using the Mizuhanome system which senses the drive to kill. Sakaido is a brilliant detective and pilot of the Mizuhanome. To solve a case, he enters the world of the killer's unconscious mind: the id well. In the shadows of brutal and puzzling cases lurks John Walker, the Serial Killer Creator. Where will Sakaido's pursuit lead?<br>
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(Source: Funimation)

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Fábio Matsuoka is a Brazilian actor, voice actor, and publicity announcer. He is best known for being the official announcer for History Channel 2 in Brazil since 2014, when the channel was founded.