Inuyasha
Inuyasha (犬夜叉) is the main male character in the series. Although his exact age is unknown, his appearance and general behavior are "equivalent" to a human 15-year-old at the start of the series. Born to a dog-demon father and a human mother, Inuyasha is a dog demon/human hybrid who initially wanted to use the enormous power of the Sacred Jewel of Four Souls to become a full-fledged 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 was given the task to protect the jewel. Inuyasha changed his mind and instead, wanted to use the Jewel of Four Souls to become a human so that he could live with her, but, Naraku (an evil half demon) manipulated the both of them into believing they had been betrayed by one another. Being a shape-shifter, he used Kikyo's appearance to deceive and attack Inuyasha, and vice versa. Before Kikyo died, however, she shot the real Inuyasha with a sealing arrow that sealed him to the Sacred Tree of Ages. Inuyasha remained there for fifty years, until Kagome Higurashi (Kikyo's reincarnation) pulled out the arrow and broke the seal (To save some villagers from an evil demon)
Kagome Higurashi
Kagome Higurashi (日暮 かごめ) is the main female character and narrator of the series. Aged fifteen at the start of the series, she is a middle-school student born 12 March 1982 in modern Japan. She is the reincarnation of the deceased priestess Kikyo. Kagome has the sacred Shikon Jewel unknowingly hidden inside her body until her 15th birthday, when a demon pulls her into the Bone Eater's Well at her family's shrine and takes her five hundred years back through time.
Miroku
Miroku (弥勒) is a monk, age eighteen, who travels the countryside performing spiritual services such as exorcisms and demon exterminations, although sometimes he deliberately falsifies these to earn comfortable rewards. Miroku can attack enemies with his holy staff and sutra scrolls, but his greatest weapon is the Wind Tunnel (風穴) embedded in the palm of his right hand - which is actually a hereditary curse originally inflicted by Naraku upon Miroku's grandfather. Though the Wind Tunnel is extremely powerful because it can suck in almost anything in its path, it grows larger with continuous use and will eventually consume Miroku, as it consumed his grandfather, Miatsu, and his father. Miroku is able to seal up his wind tunnel with the prayer beads that are wound around his arm, but the curse can only be broken by killing Naraku.
Sango
Sango (珊瑚) is a demon slayer, aged sixteen, who hails from a village of professional demon slayers. Of her broad repertoire of tools and tricks for fighting demons, Sango's most powerful weapon is the Hiraikotsu (飛来骨), a massive boomerang made of purified demon bones. Her other weapons include a concealed sword and poisons. She is accompanied by the demon cat Kirara, who accompanies Sango into battle.
Shippo
Shippo (七宝) is an orphaned young fox demon, age seven, who attempts to steal the Shikon Jewel from InuYasha and Kagome, wanting to become stronger and avenge his father's death. Though his plan fails, InuYasha and Kagome aid him after hearing his story, and he becomes their companion for the rest of the series.
Kirara
Kirara (雲母) (pronounced "Ki-la-la" in English) is Sango's faithful demon-cat companion. Kirara usually appears to be a small kitten-sized feline with two tails, but can become large enough to carry several passengers (usually Sango, Miroku and Shippo) whenever the need arises. Her full-sized form has more prominent fangs, flames around her feet and tail, and enough power to fly through the air fast enough to keep up with InuYasha's top speed. In her small form, she is small and cute, with no fangs, wide eyes, and two tails. Because of her cuteness, Kirara is often the victim to one of Kagome's dress-up games. It is made apparent that Kirara once belonged to Midoriko when they go to her cave for the first time. When Kohaku's memory returns, Kirara is the first character to find out.
Naraku
Naraku (奈落) is the main enemy of the series. The one who is responsible for most of the characters' misfortunes, including Kikyo's death, InuYasha's sealing 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-his intent being that she would use the Jewel to save herself and thus both would be corrupted and be his. Unlike other half-demons, he can choose what time will he lose his demonic powers, however he reverts to a head attached to multiple demons. During this time he discards the weaker demons that he is attached to.