is a student who attends the fictional Sarayashiki Junior High School. His poor attendance, constant fighting, and bad habits have earned him the label of a delinquent among most of his teachers and classmates. This all changes rather abruptly as Yusuke is struck by a car and dies while trying to save a small child who had wandered into the road. Such an altruistic deed catches the underworld by surprise. As they don't have a place for him yet in heaven or hell, he is permitted to return to his body and resume his life. However, while doing so it is revealed that Yusuke has a particularly strong aura, or spirit energy, and Koenma, the son of Enma, lord of the underworld, recruits him as Underworld/Spirit Detective and Yusuke is charged with investigating supernatural phenomena in the human world and capturing criminals dealing in underworld crime.
Yusuke bears a bit of affection for his childhood friend Keiko Yukimura, who initially takes a role as Yusuke's conscience, making sure he comes to class and behaves, and later becomes his romantic interest. Yusuke's mother, Atsuko, who is shown constantly drinking throughout the story, raised him as a single mother.
Yusuke's most common attack is the , or Spirit Gun. Aura/Spirit energy is concentrated into his right index finger and released as a projectile as though his hand were a gun and his finger the barrel. At first he is only able to muster a single shot per day, but as he trains with Genkai he is able to fire multiple shots per day, as well as developing minor variations on the technique. Yusuke is also a descendant of the demon king Raizen and, ever since his resurrection during the Chapter Black arc, retains his demon side and demon energy more than his human side. At the end of the manga, Yusuke opens up a ramen shop, and also spends time helping humans and demons learn to cooperate.
is a student who attends the fictional Sarayashiki Junior High School. He is noted as the "second toughest punk at Sarayashiki", despite his unusual affinity for kittens. He is constantly picking fights with Yusuke to prove himself tougher, but never succeeding. Eventually Kuwabara's feelings of anger toward Yusuke become feelings of respect.
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