This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular browser and smartphone game "Touken Ranbu -ONLINE-" comes a Nendoroid of the Bizen sword, Okanehira! He comes with three face plates including a standard face, a combat face as well as a smiling expression based on his "Naturally" line from the game. His sword can be displayed both sheathed or drawn allowing you to recreate various scenes from the game. Be sure to add him to your collection!