Yū Kobayashi (小林 ゆう, Kobayashi Yū, born February 5, 1982) is a Japanese voice actress and singer affiliated with Holy Peak. Some of her most prominent roles include that of Tadamichi Aoba in Dan Doh!!, Setsuna Sakurazaki in Negima! Magister Negi Magi, Dan Kuso in Bakugan Battle Brawlers, Misaki Hijiri in Saint October, Kaede Kimura in Sayonara, Zetsubou-Sensei, Sasha Blouse in Attack on Titan, Lucina in the Japanese version of the Fire Emblem series, and Luka Urushibara in Steins;Gate, among others.