Sonia Branch, born Sonia Zucco, was the head of the Gotham National Bank.
Born to gangster Tony Zucco, Sonia was scorned when her father was ousted as the murderer of the Flying Graysons. Living in regret, though she had nothing to do with the incidence, as soon as she got the chance, Sonia changed her last name to Branch. Although she initially thought her father dead, she later learned he was alive and well, living with her half-siblings in Chicago. Sonia later revealed this fact to Richard Grayson after his investment in her bank failed.