WARNING: The following contains spoilers for Titans Season 3, Episode 12, "Prodigal," available now on HBO Max.
In the penultimate episode of Titans' third season, "Prodigal," Dick Grayson briefly finds himself in the afterlife, encountering a vision of his father before being revived by the Lazarus Pit. But while he's there, he also sees someone who has yet to be born -- a little girl who addresses him as "Daddy."
This could be the Titans incarnation of a very specific figure from a fan-favorite DC Universe -- Mar'i Grayson, aka the daughter of Nightwing and Starfire, who grew up to become the heroic Nightstar.
The world of Kingdom Come -- created by Mark Waid and Alex Ross teased a potential future for the figureheads of the DC Universe. Now regarded as Earth-22, this was a world where the old guard got older and new generations rose up to take their place in the world as heroes and villains in their own right. One of the most prominent of the heroes introduced in this reality was Nightstar. Mar'i Grayson is the daughter of her world's Nightwing and Starfire, and possessed the powers and the temperament of her mother. While her mother eventually separated from her father and passed away years earlier from an illness, her father remained a heroic figure in the world.
When Superman returned from his self-imposed exile at the Fortress of Solitude, his reformed Justice League recruited Grayson in his new role as Red Robin to serve as warden for their new super-human prison. Meanwhile, Nightstar instead chooses to side with Batman and his forces, who aim to serve as a counter to Superman's ambitions. In the ultimate conflict of the storyline, Mar'i ends up putting her differences with her father aside when she sees him seriously injured on the battlefield. Taking him and flying him to a hospital for urgent care, Nightstar unwittingly saved both of them from the atomic bombs that end up exploding and killing numerous heroes across the battlefield.
After the battle, Nightstar witnessed the reconciliation of her father and his mentor and remained an active hero for the changing world. She became a hero and a leader of this reality, forging a close bond with Avia, the daughter of Mister Miracle and Big Barda. She eventually forged a surprisingly deep connection with Ibn Al Xu'ffasch -- this reality's son of Bruce Wayne and Talia al Ghul, aka the equivalent of Damian Wayne. The pair reappeared in The Kingdom, having begun a formal romance despite the attempts by her father to temper their relationship before it really began. Due to the efforts of Magog in The Kingdom, this future was at risk of being erased from existence, with Mar'i and Ibn finding each other in those uncertain times.
Thanks to Rip Hunter, a small team was able to form a new iteration of the Titans -- consisting of Nightstar, Ibn, Kid Flash (the daughter of Wally West) and Offspring (the son of Plastic Man). She helped fight back against the villain and was crucial in his defeat -- and the discovery of Hypertime. A tease of that timeline's ultimate future -- where the Superman legacy helped push humanity into the distant future in Justice Society #22 by Geoff Johns, Dale Eaglesham and Alex Ross -- implied Mar'i and Ibn would eventually even wed and have children of their own, helping the Wayne family live on in new generations. While she's a relatively obscure figure, it's interesting to see Mar'i teased in this way -- setting up the potential for the Titans world to take some cues from the future of Kingdom Come.