Damian Wayne in the context of "Martha Wayne"

Dr. Thomas Wayne, M.D. is a fictional character appearing in American comic books published by DC Comics. He is the father of Bruce Wayne (Batman), and husband of Martha Wayne as well as the paternal grandfather of Damian Wayne. Wayne was introduced in Detective Comics #33 (November 1939), the first exposition of Batman's origin story. A gifted surgeon and philanthropist to Gotham City, Wayne inherited the Wayne family fortune after Patrick Wayne. When Wayne and his wife are murdered in a street mugging, Bruce is inspired to fight crime in Gotham as the vigilante Batman.

Wayne was revived in Geoff Johns' alternate timeline comic Flashpoint (2011), in which he plays a major role as a hardened, more violent version of Batman, whose son was killed instead of his wife and himself, leading both of them to become the altered reality's counterparts of Batman and the Joker respectively, and dies again by the end of the storyline. Dr. Wayne returned to the main DC Universe in DC Rebirth, as a revived amalgamation of his original self killed by Joe Chill and his Flashpoint Batman self killed in "The Button", teaming up with the supervillain Bane to attempt to force his son to retire as Batman.

Robin is the alias of several superheroes appearing in American comic books published by DC Comics. The character was created by Bob Kane, Bill Finger, and Jerry Robinson to serve as a junior counterpart and the sidekick to the superhero Batman. As a team, Batman and Robin have commonly been referred to as the Caped Crusaders and the Dynamic Duo. The character's first incarnation, Dick Grayson, debuted in Detective Comics #38 (April 1940). Conceived as a way to attract young readership, Robin garnered overwhelmingly positive critical reception, doubling the sales of the Batman titles. Robin's early adventures included Star Spangled Comics #65–130 (1947–1952), the character's first solo feature. He made regular appearances in Batman-related comic books and other DC Comics publications from 1940 through the early 1980s, until the character set aside the Robin identity and became the independent superhero Nightwing.

The character's second incarnation, Jason Todd, first appeared in Batman #357 (1983). He made regular appearances in Batman-related comic books until 1988, when he was murdered by the Joker in the storyline "A Death in the Family". Jason was resurrected following a reality-changing incident, eventually becoming the Red Hood. The premiere Robin limited series was published in 1991, featuring the character's third incarnation, Tim Drake, training to earn the role of Batman's vigilante partner. After two successful sequels, the monthly Robin series began in 1993 and ended in early 2009, which also helped his transition from sidekick to a superhero in his own right. In 2004 storylines, established DC Comics character Stephanie Brown became the fourth Robin for a short time before the role reverted to Tim Drake. Damian Wayne succeeds Drake as Robin in the 2009 story arc "Battle for the Cowl."

Richard John "Dick" Grayson is a superhero appearing in American comic books published by DC Comics, commonly in association with Batman, the Teen Titans, and the Justice League. Created by writer Bill Finger and artist Bob Kane, he first appeared in Detective Comics #38 in April 1940. Dick is the original and most popular incarnation of Robin, Batman's crime-fighting partner – together known as the Dynamic Duo. In his origin story, he is the orphaned son of master acrobats the Flying Graysons who is later adopted by Batman's alter ego Bruce Wayne.

Dick Grayson has undergone significant character development since originally introduced in 1940. In 1984, he graduated from the role of Robin to become the adult superhero Nightwing, protector of the city of Blüdhaven, Gotham City's economically troubled neighbouring city. Since then, as Bruce's eldest son, Dick has taken on an older brother figure to his male successors as Robin – tearaway Jason Todd, teenage prodigy Tim Drake, and trained assassin Damian Wayne, who is also Batman's biological child. Among other members of the Batman Family, his closest relationships are with Batman's loyal butler and father figure Alfred Pennyworth, and with his romantic interest Barbara Gordon, who served as Batgirl alongside Dick as Robin, and who later aids Nightwing as Oracle. Dick has also taken up the mantle of Batman himself on a number of occasions when Bruce was missing, incapacitated, or believed dead.

Ra's al Ghul is a supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. Created by editor Julius Schwartz, writer Dennis O'Neil, and artist Neal Adams, the character first appeared in Batman #232's "Daughter of the Demon" (June 1971).

Most notable as the leader of the League of Assassins, Ra's al Ghul's name in Arabic translates to "Head of the Ghoul". He is the son of Sensei; the father of Talia al Ghul, Ali al Ghul, Nyssa al Ghul, Dusan al Ghul and Arkady Duvall; and the maternal grandfather of Damian Wayne, who is the biological son of Bruce Wayne/Batman and Talia. Other versions include other grandchildren such as Athanasia al Ghul (Injustice timeline), Hafid al Ghul (Damian's clone), Tallant Wayne (Brotherhood of the Bat timeline), and by last the siblings: Saif al Ghul, Taj al Ghul and Janan al Ghul (in the Earth al Ghul timeline). Stories featuring Ra's al Ghul often involve the Lazarus Pits, which restore life to the dying. The Lazarus Pits have considerably prolonged Ra's' life, making him particularly dangerous, as he has honed his combat skills for centuries. Though primarily an enemy of Batman, Ra's has also come into conflict with Superman and other heroes in the DC Universe.