Though she has shined on the Young Justice animated series, Miss Martian has rarely gotten the chance to be a fan-favorite hero like her uncle J'onn J'onzz the Martian Manhunter. She has since become an underrated Teen Titans member, but not on the same level as her animated counterpart.
On Earth-2, Bruce Wayne became a father to Helena Wayne, who grew up to be that reality's version of Huntress. Helena is a perfect fusion of Bruce Wayne and Selina Kyle; she became a hero to avenge her parents, but she also has a lot of Selina in her.
After suffering tragedy after tragedy for many years, Roy Harper was given a diamond in the rough in the form of a daughter named Lian. Immediately, Roy's story became that of a single father trying to be the hero Arsenal while also taking care of a sweet little girl.
Batman's life often feels like a soap opera, with how many twists and turns happen to him and his family, such as with Lincoln March. Lincoln was an elite Talon assassin for the Court Of Owls, and according to him, he was born Thomas Wayne Jr., the older brother of Bruce Wayne
The short-lived Future State continuity introduced a new alternate version of Batman of the future, who was revealed to be Timothy Fox, the son of Lucius Fox. Lucius Fox's family has quite the legacy in the world of Batman, with his other son Luke becoming Batwing.
The Injustice universe introduced multiple new concepts to the DC lore; one was a different Supergirl named Lara Lane-Kent. Rather than Kara Zor-El, Lara is the daughter of Clark and Lois, who became Earth's greatest defender in a vision of a possible future had Lois not died.
Yet another sibling for a hero they didn't know about, Cobalt Blue is the twin brother of Barry Allen, who disappeared thanks to overly convoluted events. It resulted in the brother being adopted by Eobard Thawne and named Malcolm. One thing led to another, and Malcolm eventually became the villain Cobalt Blue, another speedster villain for The Flash to fight.
Kate Kane did not always operate alone; she once brought her younger cousin Bette into the mix as a forgotten member of the Bat Family. Bette Kane has gone by the moniker of Flamebird, then would grow into the role of Hawkfire, a character that would become part of the Teen Titans and Young Justice.
John Henry Irons is already an underrated character in the Superman mythos, so his daughter Natasha becoming a next-generation hero was a bold but welcome choice for DC to make. In many ways, Natasha took on the role of Steel even better than her father, becoming a powerful Titans member.
Hippolyta "Lyta" Trevor is the daughter of Steve Trevor and Wonder Woman. Eventually, she would grow up to become Fury, considered the Nightwing of the Wonder Woman mythos, and a founder of the Infinity Inc. superhero team.