Doku, Lord of the Greater fiends, is the armor-clad, ghost-like fiend who attacks the Hayabusa village early on in Ninja Gaiden. He, along with Alma and Marbus, are the three Greater Fiends under the Vigoor Emperor. After Alma's initial defeat, Doku captures Rachel and takes her back to an ancient colosseum where the two face off again. Ryu vanquishes Doku and gains his soul-sucking sword, the Kitetsu. Doku, with the help of Nicchae and Ishtaros, recaptures Rachel and intends to use her as sacrifice to fully awaken Alma's powers, but is cut short when Hayabusa battles with Alma and Alma herself stops the awakening. Doku and the young Hayabusa ninja battle one last time with Doku now without armor and also much tougher. Ryu strikes Doku down for a final time, only to have Doku curse Ryu and awaken his own fiendish blood lurking inside.
Doku reappears in Ninja Gaiden: Dragon Sword, apparently brought back by the power of the Dark Dragon Stones, only to be taken out once and for all.
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