Yuki is one of the founders of Λucifer, and is the one who decided on the band's name. He knows good musical talent when he hears it, and was a major part of recruiting members into the band. He is usually calm and collected, but he cares a great deal about the group. He's also very suave. Yuki was the heir to a family of Noh performers, an ancient, traditional, Japanese theater style. Yuki's father put great pressure on him to continue the family art, even though his heart longed to devote all time to Λucifer. His family obligations are great, yet Yuki manages to live under the strain (IN THE MANGA). He's the only memeber of the band married, with a son named Yukihiko.