Taimanin Asagi (Anime)

Oboro, for all her sadism and acceptance of Black's goals on the surface, never truly accepted the demonic presence inside her. For all she facilitated Asagi's induction into the arena, it was always out of a homoerotic rivalry as warriors. it was for this that she failed in the end. She never fully grasped the true nature of what was occurring when she inducted herself into the world of demons. Rather, it's Asagi who Black understands the true potential of. After the death of her boyfriend, she loses all ties to the ways of a ninja, ways which Oboro was still bound to, despite her demonic possession. Asagi then falls into a fully carnal state, engaging in nihilistic violence after killing her ties to her old ninja order.

Asagi, in doing so, better fulfill Black's goal and ideal than Oboro ever did. Violence is as we can all know from Bataille, the opposite side of sex, with both being expressions of the same libidinal force, what Suda51 uses again and again in his games as "blood". This libidinal-becoming is a way of eros, and ultimately, it's induction into this that Black desires. Ninjas, who follow ways of thanatos, are kidnapped and forced into a world of overwhelming libido in the hopes that they'll change the way into life-producing, not life-negating. Oboro, for all she appeared to be on Black's side, was always more like Asagi than anyone else. She still remained, through all of it, wedded to the death-drive of the warrior, when the purpose of the series is the remaking of death-driven warriors into life-driven immortals.