Hiei

Hiei is a former criminal from the Demon World and one of Yusuke Urameshi's closest allies in Yu Yu Hakusho. Born to an ice maiden and cast away as an infant, he first appears as an enemy before joining the group during later missions.

Hiei's journey from enemy to ally

Cold, proud, and impatient, Hiei values strength and independence but gradually reveals fierce loyalty. He searches for his sister Yukina while hiding their relationship so that she will not be burdened by his violent past.

The Jagan Eye, Yukina, and the Darkness Flame

Hiei fights with exceptional speed, swordsmanship, the Jagan Eye, and the Dragon of the Darkness Flame. His rivalry with Yusuke and partnership with Kurama help turn him from an isolated avenger into a trusted member of the team.