This is a posable action figure from the Nendoroid series.
From the GoodSmile website:
The strongest of the Maverick Hunters.
From the popular "Mega Man X" series comes a Nendoroid of the Maverick Hunter, Zero! He comes with two face plates, including a calm and composed standard expression as well as a shouting expression for combat scenes. Optional parts include his Zero Buster as well as his iconic Z-Saber weapon with two different blade parts allowing for various different situations.
His legs are also specially articulated, allowing you to pose him in the dashing pose and jumping poses! Be sure to add him to your collection and recreate your favorite scenes from the game in adorable Nendoroid size!