Yusuke
Fourteen-year-old Yusuke Urameshi is the worst student at Sarayashiki Junior High. He gets terrible grades, skips class as often as possible, and has little respect for authority. On top of that, his coarse language and brash, arrogant manner get him into more altercations than he can count. Fortunately for him, he's good at protecting himself.

Really good. In fact, Yusuke has the reputation of being the toughest kid in town. But despite his killer rep, Yusuke is misunderstood. His home life is troubled. He is constantly hounded by his teachers, by his mother, and by fellow students gunning for him... As such, Yusuke is generally pretty miserable. Only after being assigned the job of Spiritual Detective does Yusuke truly begin to find his place in life.



Hiei
Hiei is a fire apparition whose true origins are unknown. He is a master swordsman, and his strength and speed are incredible. However, these are hardly his most fearsome abilities. Typically kept concealed behind a bandanna on his forehead is the Jagan, a mysterious third eye that possesses magical properties. With it he can control weak-minded humans, send telepathic messages, and move objects telekinetically. Hiei is fiercely independent, and his raw ambition drives him to pursue his own agenda at all times. Although he generally cares little for human life, and views others as mere obstacles in the pursuit of his own goals, Hiei strictly adheres to his own unique code of honor. As such, he helps those who help him, and is fiercely loyal to those who have managed to earn his respect.





Kurama
Not actually a human, Kurama has lived for over 300 years and possesses the wisdom and knowledge one would expect of someone his age. He is generally soft-spoken, almost eerily calm, even in the face of great adversity. But this calm exterior belies Kurama's incredible strength. He is a powerful, ruthless warrior, with wisdom and experience. As such, he is a formidable opponent to all he battles.




Kuwabara
Kuwabara is Yusuke's chief rival at Sarayashiki Junior High. Like Yusuke, he isn't the greatest student, but he is an excellent fighter. Next to Yusuke he is a formidable adversary. Kuwabara is driven by an unwavering desire to be the best. Adding comic relief to Yu Yu Hakusho, Kuwabara has an affinity for kittens.



Keiko (Kayko)
Kayko is Yusuke's closest (and at times, only) friend. She and Yusuke have known each other since they were little children, and although he would never admit it, she is probably the person that he cares most about in the world. As such, Kayko has a unique ability to talk sense into Yusuke when he is being stubborn or unruly. Kayko is one of the leading students in her school. Intelligent, friendly, and outgoing, she is well-liked and respected by her peers. She is confident, self-assured, and at times a bit head-strong. She is brave in the face of danger, and will not hesitate to put herself at risk in order to help a friend in need.



Genkai

Genkai, aging master of the Reidoha (or Spirit Wave) fighting technique, wishes to pass her knowledge to one worthy pupil before she dies. Yusuke is chosen to be that pupil, and he soon discovers Genkai's training to be the most difficult ordeal of his life. Despite her advanced years, Genkai constantly amazes Yusuke with her ability to perform superhuman feats of strength and agility. Her wit is as finely honed as her technique, and she possesses the wisdom that comes from a life rich with experience. Impossible to intimidate, she stares unflinchingly into the face of danger, ready to meet even the most daunting of challenges.




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