After the coup in which Scrimgeour is killed, the Ministry comes under the de facto control of Voldemort, who appoints Thicknesse as his puppet Minister. Thicknesse joins the ranks of the Death Eaters for the rest of the book and fights with them at the Battle of Hogwarts, where he duels against Percy Weasley (who Transfigures him into a sea urchin). Following the end of the battle, the Imperius Curse that was placed upon him is broken. Kingsley Shacklebolt replaces him as interim (later permanent) Minister for Magic. Not much is known about the "real" nature of Thicknesse, as he has been under the control of Yaxley for nearly the entire book.