This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From KOJIMA PRODUCTIONS' internationally popular game "DEATH STRANDING" comes a DX Nendoroid of Cliff! The Nendoroid is fully articulated, and his various equipment has been faithfully recreated in Nendoroid form.
He comes with both an expressionless face plate and a face plate with closed eyes. Hand parts to recreate his smoking pose and pointing pose are included, along with a baby doll and rifle optional parts.
The DX version also includes alternate head parts to display him with his helmet on, an interchangeable smiling expression face plate and a skull face plate for recreating the skeleton soldiers that he summons. Be sure to add him to your collection!