, commonly referred to just as , is a fictional character who is the protagonist in the manga and anime series Eyeshield 21, created by Riichiro Inagaki and Yusuke Murata. In the series, he is a first-year Japanese high-school student who becomes a gofer to avoid being bullied. His running ability improves and he is noticed by Yoichi Hiruma, the American football team's captain, who gets him to join the Deimon Devil Bats as the team's running back under the name "Eyeshield 21". Sena has appeared in other media from the series, including video games, original video animations (OVAs) and light novels.