Jimmy Briggs

Jimmy Briggs was an inmate of Arkham Asylum and later Arkham City.

Arkham Asylum Incident
He was locked up in Arkham Asylum for having delusional behavior, although he himself was not criminal. In fact, he was one of the more well-behaved inmates as well as a favorite of one of Arkham Asylum's security guards, Aaron Cash.

Between Arkham Asylum and Arkham City Incident
When Arkham City was opened, all inmates were transferred to Arkham City. Although Cash knew Briggs didn't deserve the transfer since he was not dangerous, he was ultimately forced to let them, despite Briggs' protests, as it was out of his hands.