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ninja Hiei is the offspring of a mating between a Koorime (Hina) and an unknown fire demon. Hina is born a Koorime, a race of self-reproductive ice demons who are all female. She fell in love with a fire demon and bore his son. However, this kind of action is considered a crime in the Island of the Koorimes, which floats above the Makai. Thus, he was given the title, "The Forbidden Child", and as an infant was thrown overboard by Rui, Hina's best friend. Before she did, however, she told the infant that if he must, he should come back and take revenge upon the Koorimes. Hina shed two tears which turned into gems, one for Hiei and one for his sister, Yukina, who is full fledge Koorime. Then he was thrown off.
A band of thieves picked up Hiei in the forests of the Makai and took him in as one of their own. He learned survival skills, thievery and such. As he grew more and more powerful, the thieves finally left him, perhaps out of fear, for at the age of five he was an A class demon. He carries his katana (sword) everywhere as means of weaponry. His only pursuit was strength and his long lost sister, Yukina. He also looks for his tear gem, which he lost during a fight when the chain was broken, causing it to fall into a rushing river.
When he learned that Yukina had left the island (which was destructing) to search for him, he went to a demon named Shigure. He told Shigure his story and asked for a 'jagan,' a third eye to be implanted. Shigure did just that, and Hiei's power sunk, making him no longer an A class demon. Hiei gained back his power when he learned the jagan's techniques, such as the Kokuryuha (the Black Dragon Wave) and what we call Majin Hiei, which is his tranformation process where his skin turns green and numerous eyes appear all over his body. Shigure's price was Hiei's tear gem, and after Hiei finds Yukina, he must not tell her that he is her brother, also. He may have wanted to protect her from the truth of what he really is, anyway.
Hiei returned to the Island of the Koorimes, where he found Rui by Hina's grave. She told him Yukina had left to find him. She said he could kill her because Hina had committed suicide due to the loss of her son. Hiei didn't do a thing, but disappeared.
One of the biggest Yu Yu Hakusho events is the Ankoku Bujutsukai, a tournament on Hanging Neck Island in Ningenkai, where the reward is any wish granted. Hiei's team, the Urameshi team, won. Toguro Ototo wished for Genkai to be resurrected. Soon after, anther tournament arose. This time, it was with the three overlords of the Makai, the three most powerful demons. Their names were Yomi, Raizen, and Mukuro. It turns out Raizen was Yusuke's ancestor, and for survival he needs to feed on humans. Raizen refuses to do it, and soon after his death Yusuke took his place. Kurama joined Yomi, and Hiei became the heir of Mukuro. Before he left the Nigenkai, he was given a tear gem from Yukina. She indirectly called him "brother," and explained that it was because he would probably be what her brother would be like. He strings the gem into a pendant and left for the Makai.
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