Hiei is a character in the 90s anime, Yu Yu Hakusho. He is a fire demon who possesses the Jagan Eye, which allows him to see something anywhere. He starts off as an antagonist, capturing Keiko and threatening to turn her into a demon with his sword. Like the fellow demon Kurama, he becomes an ally to Yusuke, namely in defeating the Four Saint Beasts. With his impressive speed and swordsmanship, Hiei is a formidable fighter. His twin sister is Yukina, who becomes the love interest of Kuwubara.