Unlike his counterpart in the mainstream DC Universe, this version of the Sensei was more directly responsible for the murder of Boston Brand, creating the ghostly hero Deadman. In the comics, the Hook killed Boston Brand as part of his attempt to join the League of Assassins (one of the rules of joining the League being to pull off a public assassination and escaping without anyone learning the assassin's identity) with Brand simply being the easier target between him and Dick Grayson, who was performing the stunt with him. The Sensei served the Ra's al Ghul of the animated series, training assassins for the immortal's use.
This version of the Sensei was more directly responsible for the murder of Boston Brand, creating the ghostly hero Deadman. In the comics, the Hook killed Boston Brand as part of his attempt to join the League of Assassins (one of the rules of joining the League being to pull off a public assassination and escaping without anyone learning the assassin's identity) with Brand simply being the easier target between him and Dick Grayson, who was performing the stunt with him. The Sensei served the Ra's al Ghul of the animated series, training assassins for the immortal's use.