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The Black Mask's face has a black mask and a scary look on it. He also has a white shirt, black tie, black gloves, and brown straps. He also has black legs.
According to Oracle in the Road to Arkham prequel oneshot, Black Mask was involved in a gang war and retreated to Bludhaven, home of Nightwing.
It's been revealed that Black Mask was the only inmate to ever escape Arkham City, doing so using explosives he stole from Penguin to blow a hole into the perimeter wall. This prompted Strange to line the wall with automatic machine guns that would instantly kill anyone who approached. As Bruce Wayne was being admitted to Arkham City, Black Mask was seen as one of the criminals being transferred into the cell block, having finally been recaptured by Tyger Forces. Sionis was busy fending off the TYGER forces with a chair; however, he was eventually detained. Using this to his advantage, the Joker was able to capture Sionis Industries and it was quickly modified into Joker's Funland, Joker's base of operations in Arkham City.
With the growing violence in Arkham City, as the three primary gangs (Joker's, Penguin's and Two-Face's gangs) fighting for control over the city, Black Mask secretly allied himself with the Riddler and slowly built up his forces for his plans to retake Arkham City in the confusion.