Hiei Jaganshi is a central character in the anime series YuYu Hakusho. He is a fire demon known for his cold demeanor and immense power. As a member of Yusuke Urameshi's team of Spirit Detectives, Hiei plays a crucial role in battling various supernatural threats. His most notable abilities include super speed, swordsmanship, and the use of the Jagan Eye, which grants him telepathic powers and control over flames. Despite his aloof personality, Hiei shows deep loyalty to his allies and undergoes significant character development throughout the series.