Hiei

Hiei (飛影, Hiei) is a hybrid fire and ice demon who befriends Yusuke. His mother is forced to abandon him as a child because of his mixed nature, which leads to him kill to survive most of his life. He has a special jewel made out of his mother's tear, though he eventually loses it. He takes the Jagan implant from Shigure, which reduces him to a D-Class demon, in order to find it and his village. He seeks out his village and learns that he has a twin sister, Yukina, who is no longer in the village. He gives up on his search for the jewel and seeks out his sister instead. Shigure has Hiei swear an oath never to tell Yukina that he is her brother as payment for the eye, although he doesn't plan to tell her either way. He is voiced by Nobuyuki Hiyama in Japanese media and Chuck Huber in the Funimation dub. Kirk Thornton provides the character's voice in YuYu Hakusho: The Movie and James Stanley voices him in YuYu Hakusho, The Movie: Poltergeist Report.

Hiei has some pyrokinetic and cryokinetic powers, and a natural resistance to them. He is a master swordsman, having learned under Shigure, capable of moving at extreme speeds. The Jagan (邪眼, Evil Eye) is a third eye on his forehead that grants him various telekinetic powers, including hypnosis, telepathy, and remote viewing. He can transform into a demon form with green skin and eyes sprouting all over his body, which grants him enhanced abilities. He can summon the Dragon of the Darkness Flame (邪王炎殺黒龍波, Jaō Ensatsu Kokuryūha, lit. Tyrant-King's Blaze-Murdering Black-Dragon-Wave), powerful demon energy launched in the form of a dragon that cannot be controlled once released. It causes his arm to be unusable at first, but he eventually learns how to control it better and absorb the energy itself to increase his offensive and defensive abilities while draining energy at a high rate.

Source: Wikipedia