Naraku is the series’ primary antagonist. He is responsible for most of the characters’ misfortunes, including the death of Kikyo, the sealing of InuYasha to the sacred tree, Miroku’s curse, and the death of Sango’s family. Naraku was born from the fusion of Onigumo, a crippled human bandit tended by Kikyo, and a horde of weak demons. Driven by frustrated lust for Kikyo, Onigumo made a bargain with the demons: they could eat his flesh, and the demons would combine into one entity to become part of that new body. However the resulting half-demon promptly caused Kikyo’s death in an attempt to corrupt and possess the Shikon Jewel.
Naraku is driven by three goals: To become a full demon, to possess a fully-corrupted Shikon Jewel, and to possess Kikyo. The third goal is rooted in Onigumo’s heart as a vital part of Naraku’s body, causing an obsession with Kikyo that prevents him from killing her. He attempts to rid himself of Onigumo’s heart multiple times, ultimately separating it into a different body. With his heart freed from his obsession, he is able to later kill Kikyo. Prior to his demise, however, he expressed regret at not being able to have her for his own.
Throughout the series, Naraku creates many subordinate beings from his own body to aid his goal of killing his opponents and reuniting the shards of the Shikon Jewel, whose corrupted form he hopes to use to gain ultimate power.