Dick Grayson

Dick Grayson (legal name: Richard John Grayson) (b. March 21st, 1990), otherwise known by his vigilante personas of Nightwing (currently) and Robin (formerly), is the first and oldest adopted child of Bruce Wayne and Tony Stark. He is the adopted (half-)brother of the various children of the Stark-Wayne Family and the omither of Mari Grayson, his daughter with Zatanna Zatara.
Born to Marenda and Jonas Grayson, Dick watched his biological parents be murdered by Red Hood sometime after they moved to Gotham, before he was held captive in a warehouse by the crime lord for a week. Eventually rescued by Batman, he was taken in by him and his husband, Tony Stark, while Tony was pregnant with Lili, before becoming their first adopted child. Jason Todd was later adopted by them as well.
In March 2002, Dick presented as an omega. This was initially a cause for concern for Bruce and Tony, as they feared that it meant something was wrong with his health. However, it was later cleared by the doctor that attended him. Around this time and shortly afterwards, Dick began self-defense lessons with Bucky Barnes and was put into gymnastic lessons. By December of 2002, he also took up sewing. All three of these were at least partially out of a desire to become a vigilante like his father, and he eventually made himself a suit, which was then discovered by Tony in February of 2004. Although neither Bruce nor Tony initially allowed him to wear the suit, by the end of the month they relented, and Dick became the first sidekick of Batman, Robin.
In June of 2007, Dick met the female alpha Zatanna Zatara. The two of them bonded over their Romani heritage during their first meeting, which eventually led to the two of them getting together. Their relationship only lasted for six months, as Zatanna was only in Gotham for that time-period to attend a school for witches there; before she left, however, they had sex for one last time in December, which resulted in Dick becoming pregnant with her child. When this was found out while Tony was kidnapped in Afghanistan, Dick was forced to stop being Robin, at which point Jason took on the mantle by stealing one of Dick's suit.
Dick graduated from St. Philomena's Preparatory Academy in late May/early June 2008, though he did not attend school in-person for most of the second semester of his senior year due to his pregnancy.
On October 3rd, 2008, Dick gave birth to his and Zatanna's child, Mari Antonia Grayson, who he named after his biological amither, Marenda, adopted grandmother Maria Stark, and Tony. Because of his pregnancy and her birth, he decided to take a gap year before he started college at Gotham University and moved out of the Glass House. Mari's birth came only a little more than three months before the birth of Dick's adopted sister, Kamala.
After his daughter's birth, Dick did not take a very long maternity leave from vigilantism, as he quickly took on the persona of Nightwing. Neither of his parents liked this choice, but they ultimately allowed it.