Stefano DiMera is a fictional character from the NBC soap opera Days of Our Lives, played by Joseph Mascolo. Created by Pat Falken Smith, Stefano was introduced on January 18, 1982 as the father of Tony DiMera looking to expand his criminal empire to Salem. Stefano's early storylines included his feud with Roman Brady, playing his children – Tony and Renée DuMonde against one another when he is presumed dead, orchestrating a series of murders with his son and Tony's deranged look-a-like André, and replacing the presumed dead Roman with the brainwashed John Black.

EJ DiMera is a fictional character from Days of Our Lives, an American soap opera on the NBC network. Created by head writer James E. Reilly and introduced under executive producers, Ken Corday and Tom Langan, EJ is the son of crime boss Stefano DiMera and the eccentric Susan Banks. Originally portrayed by child actors: Avalon, Dillon and Vincent Ragone from February 1997 to April 1998, the character was rapidly aged in 2006 when James Scott was cast in the role; he departed the role in October 2014. In 2018, the role was briefly portrayed by Trey Baxter. In June 2021, Australian actor Dan Feuerriegel assumed the role.