Demonslayer00

Yūsuke?) is a student who attends 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 do not 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's most common attack is the Rei Gun (霊丸 Reigan?, lit "Spirit Sphere", pronounced as "Ray Gun")[1] ("Spirit Gun" in the English anime dub). 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 such as the "shotgun" variant wherein Yusuke fires a spray of miniature spirit guns at once using his fist instead of his finger