Sounga

Sounga, alternately spelled So'unga, is an evil sword, and the main antagonist of the Inuyasha movie Swords of an Honorable Ruler. He was voiced by Ward Perry.

Role
Sounga is the sentient sword from hell, whose soul was the ancient spirit of a demon. Sounga would usually possess whoever wielded him and make him kill people, with his ultimate goal being to destroy the world. He cannot be destroyed, except by the combined power of Tetsusaiga and Tenseiga, the two swords forged from the Great Dog Demon's fangs. He came into possession of the Great Dog Demon, who was able to wield him without being possessed. Following the Great Dog Demon's death, the spirit Saya used his power to seal Sounga in a sheath and sent him through the well to the future, where he was found and kept at the shrine Kagome lived at.

Eventually, Sounga broke free of Saya's power, and Inuyasha picked him up, becoming possessed once he had crossed back to the past. Sounga made Inuyasha use Dragon Twister, which drained Sounga's power, releasing Inuyasha from the possession though Sounga remained tied to his arm through cords he projected, and Inuyasha used him to kill some ogres, who were reanimated as zombies by Sounga's power. Later, Sesshomaru fought Inuyasha for Sounga, who possessed Inuyasha again trying to force him to kill Rin for blood. But Kagome used the Beads of Subjugation to break Inuyasha free of Sounga.

Sounga then possessed an ogre and revived Takemaru of Setsuna as a specter, fusing Sesshomaru's severed left arm to Takemaru's to give him a demonic appearance and enable him to wield Sounga's full power. Takemaru did whatever Sounga said in order to exact his vengeance on Inuyasha and Sesshomaru, sons of the Great Dog Demon. Takemaru massacred people using Sounga, whose power reanimated them as zombies. Sounga told Takemaru to destroy Tetsusaiga and Tenseiga, as their presence weakened his power.

After a fight, Inuyasha killed Takemaru. Sounga continued to possess Sesshomaru's arm and manifested into a demonic form to fight Inuyasha and Sesshomaru, while opening a gate to hell intending to suck everyone on Earth into hell. Inuyasha and Sesshomaru refused to fight alongside each other most of the time, but eventually when Sounga shot an energy attack at Inuyasha, and Inuyasha used Backlash Wave, Sesshomaru used Tenseiga to combine a Dragon Strike with Inuyasha's Backlash Wave, destroying Sounga's demon form and killing him. The now-lifeless Sounga fell into the pit leading to hell, along with Sesshomaru's arm, before it closed, sealing it forever.