Jaquio

Jaquio is the primary villain in the Ninja Gaiden video games.

Ninja Gaiden NES
After Walter Smith, a professor and acquaintance of Ken Hayabusa seals off an ancient ruin in South America, Guardia de Mieux, the Jaquio appears and takes control of the ruin. Jaquio awaits Ryu Hayabusa after he sends one of his assassins, the Malice Four to steal the Demon Statue break the seal on the Dark God, plunging the world into darkness. After the MaliceFour steal the Shadow Statue from Ryu's father, Joe Hayabusa, Jaquio tricks Ryu into surrendering the Light statue while he prepares the ritual in front of the Demon's body in an Amazon temple. He succeeds in breaking the seal on the Demon but is defeated by Ryu and the Dragon Sword.

Ninja Gaiden II: The Sword of Dark Chaos
After Ashtar is defeated by the Dragon Ninja Ryu, Jaquio reveals himself somehow fully resurrected. He takes Irene hostage and grieviously wounds the US Army agent, Robert T. Sturgeon. He soon meets Ryu in a demonic altar, and reveals that the energy of the spirit of the Demon flowed into his body after their last battle, resurrecting him, and giving him unfathomable evil power. Despite his powers he is beaten by Ryu. However, his blood flowing out touches the cursed blade of the Sword of Chaos, and it sucks the life out of Irene. The gates of Hell are thrown open and the revived Jaquio takes on the form of a demon. He challenges Ryu, and is once again defeated by the Dragon Ninja. After his defeat, the Sword of Chaos is destroyed and the Hell Gate is sealed, as the castle collapses.