One half of the The Abramovici Twins, Mr. Hammer, is Harley Quinn's right-hand man as they take on the Bat in the hit game Batman: Arkham City!
The towering tattoo-laden Mr. Hammer is a green-haired, one-armed clown equipped with a massive pitted sledgehammer. Mr. Hammer and his conjoined twin Sickle are initially Russian circus performers. The twins are recruited by the Joker who has them separated to maximize their combat effectiveness. The disgruntled Sickle is excommunicated from the Joker’s gang and shows his resentment for his twin’s decision to remain with the Joker by joining the army of the Joker’s rival, the Penguin. Ultimately, following the Joker’s death, Mr. Hammer joins the army controlled by Black Mask.
The blonde-pigtailed version of Harley Quinn is dressed in a snug-fitting, short-skirted dress overlapped by an intricately-crafted dark red corset, along with gloves and thigh-high boots. Unwaveringly loyal to the Joker, Harley willingly battles any opponent, including Batman, on the Joker’s behalf, and is typically capable of confounding her opponents with unpredictable acrobatics and an array of gimmick-loaded and improvised weaponry. During the Blackgate Prison transfer, Harley Quinn neutralizes Arkham’s security, enabling the Joker to gain control of the asylum.