Rocksteady Studios

Rocksteady Studios is a British game developer responsible for Batman: Arkham Asylum, Batman: Arkham City, Batman: Arkham Knight and Suicide Squad: Kill the Justice League, as well as Urban Chaos: Riot Response. They are based in London, England.

Trivia

 * Rocksteady Studios has created several original characters for the Batman universe. Such as Quincy Sharp, Frank Boles, and the four victims of Joker's Blood: Albert King, Christina Bell, Johnny Charisma, and Henry Adams. This is not counting the several named workers/guards in all of the games.
 * In addition, they created a new alter-ego and backstory to Jason Todd, an already existing character.
 * Much of Rocksteady's staff has been in every Arkham game that they have developed, whether by pictures or by names.