Aaron Cash (Gotham Stories) - Batman: Arkham City (2011)

Aaron Cash recalled that night back at Arkham Asylum when, watching from a security monitor, he saw Quincy Sharp scrawl an elaborate message on the floor of the cell block control room using a rusty nail and blood from his fingertips before forcing his way out of the cell, only to disappear into the chaos.

He didn't know where Sharp had gone, but he was sure that there was something seriously wrong with the future mayor of Gotham City.

With no other career options available and a nagging feeling that he had seen Hugo Strange before, he reluctantly accepted the job of running a small medical team charged with providing assistance to any resident of Arkham City who needed it.