Character profile
Shinobu Sensui
仙水忍Black Angel
Biography
Shinobu Sensui was Earth's Spirit Detective before Yusuke Urameshi. Gifted with exceptional spirit awareness, strength, and a rigid moral code, he initially sees humans as victims to protect and demons as evil to destroy. Meeting Itsuki begins to challenge that simple view when Sensui realizes that not every demon is evil.
Story spoilers
A mission to seal a tunnel between Demon World and Human World exposes Sensui to the Feast of Human Vices, where humans torture demons for pleasure. The discovery shatters his moral certainty; he massacres those present, becomes obsessed with the Chapter Black tape, and later seeks to open a stable tunnel to Demon World as punishment for humanity. The supposed "Sensui's seven" are ultimately revealed not to be his human followers, but Sensui's seven personalities.
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