Naraku

Naraku (奈（な）落（らく）, "Hell") was a spider hanyō who was born from the human Onigumo and various other yōkai, and the primary antagonist of the entire InuYasha series. He was directly responsible for the death of Kikyō, the seal placed on Inuyasha, and for nearly all the other characters' misery, something that he enjoyed.

Read more about Naraku on the InuYasha wiki at Fandom ↗