Hiei (??, Hiei?) a.k.a. Hiei of the Evil Eye ( Hiei) - Hiei is a fire demon (hi y?kai) born of a K?rime (?? Ice Maiden) who specializes in speed, swordsmanship and "Jagan" (Evil Eye) skills (???). His artificially created Jagan amplifies his power and enables him to summon the black fires of Makai (Demon Realm) and channel it as an energy attack, often in the shape of a dragon. He's a bit of a hot head and is not very fond of Kuwabara. Hiei is also a bit short. His half sister Yukina is unaware of their relationship, and Hiei has gone as far as to threaten harm to others to prevent Yukina from realizing that he is actually her brother. He is called Vincent in the Philippine version of the anime to relieve dubbing issues.
Rest of the info on wikipedia
http://en.wikipedia.org/wiki/Hiei_%28YuYu_Hakusho%29
