Jaaku
Shogun of Shadows
Jaaku was an ambitious shogun who conquered Yokai villages and wanted Akiba to complete his empire. He used Orochi to kill Emperor Daisho, even as spirits warned that whispers were twisting his mind and shadows forced some of his followers to serve him. Jaaku claimed that the Queen of Monsters had freed him to take what Daisho denied him, asking only that he let her people settle in Yokai. After Ai No Miko defeats him, she offers him life if he surrenders. Voices condemn his failure as shadows engulf him, and Miko later says he is gone.
Sources
AQW Wiki: Jaaku · AQW Wiki: Ai No Miko · Jaaku’s bargain (game dialogue transcript) · Miko’s choice (game dialogue transcript)