This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular anime series and manga 'Haikyu!!' comes a Nendoroid of the Fukurodani Academy High School volleyball team's captain and one top five aces in the country - Kotaro Bokuto! He comes with three face plates including a standard expression, a surprised expression for when he senses someone is complimenting him as well as the 'Hey, hey, hey!' expression for when he successfully lands a spike!
He also comes a variety of optional parts that allow you to recreate popular scenes from the series, as well as a volleyball and a base made in the image of a volleyball court. Net parts as well as parts to display him crouching down are also included! Be sure to add the reliable captain to your collection and recreate your favorite situations from the series!