This is a posable action figure from the Nendoroid series.
From the GoodSmile website:
"You... you complete me."
From the popular DC Comics film "The Dark Knight" comes a Nendoroid of the Joker based on the highly acclaimed version of Joker played by Heath Ledger. He is also the first ever villain from a live action film to join the Nendoroid world!
His eccentric yet twisted face paint has been carefully shrunk down into Nendoroid size, and he comes with both a glaring expression and a twisted smiling expression that certainly can't be compared to any previous Nendoroid smiles! The back, left and right sides of his trademark purple coat are all movable, allowing you to easily pose anything from his signature standing poses to casually cracking a joke. Optional parts include a knife, stacks of money and a joker playing card, allowing you to recreate various different situations as well!