InuYasha (犬夜叉) is the male protagonist of the series, aged sixteen in appearance and mindset. Born to a dog demon father and human mother, InuYasha is a half-dog demon who initially wants to use the power of the Sacred Shikon Jewel to become a full-blooded demon like his older half-brother, Sesshomaru. Fifty years prior to the main era of the storyline though, InuYasha fell in love with the priestess Kikyo, who guarded the jewel. InuYasha changed his mind and wanted to use it to become human so he can live with her, Naraku manipulated both of them into believing they have been betrayed by one another. Naraku disguised himself as InuYasha and attacked Kikyo's village, fatally wounding her. Before she died, she shot Inuyasha with a sacred sealing arrow to seal him onto the Sacred Tree. InuYasha remained in suspended animation for fifty years until Kagome Higurashi, Kikyo's reincarnation, pulled out the arrow and broke the seal of the arrow. later on, Kagome shot a sacred arrow at a demon who was escaping with the jewel. The arrow slew the demon, but it also hit the Shikon Jewel and shattered it. InuYasha and Kagome travel together to retrieve its fragments. At first, he is hostile and uncooperative, but Kikyo's sister, Kaede gives Kagome a magical necklace that restrains him by hurling him to the ground whenever Kagome gives the simple command word "Sit!" called the Subjucation Beads. Initially wary of Kagome resembling Kikyo, InuYasha grows to trust her as a friend that tags along. Soon after, InuYasha begins to have feelings for Kagome. At the end of the manga, InuYasha marries Kagome becoming Sota's brother-in-law and Nodoka's son-in-law.
In the anime, he is voiced by Kappei Yamaguchi. In the English dub, he is voiced by Richard Ian Cox.