This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular anime series "Osomatsu-san" comes a Nendoroid of the eldest son of the Matsuno family, Osomatsu! He comes with a smiling expression, a playful drunk expression as well as a blank expression with a variety of different stickers for you to create your very own expression!
Optional parts include some of Chibita's oden, some beer and a variety of different hand and leg parts to allow for all sorts of different poses! Be sure to display him with his other brothers who are planned to be released as Nendoroids!