He has grown from the boy he was during his difficult beginnings as Robin. He has learnt compassion, gentleness, the worth of human life.
The value of family over legacy.
But his past mistakes still haunt him.
He has grown closer to Richard, and Todd and Cain became Jason and Cassandra over the years. He has more or less amicable relationships with the Gotham associates that are not quite part of the family but still within their sphere of acquaintance.
He is no closer to mending his relationship with Timothy Drake.
He does not blame the man. He has done tremendous damage to its foundations with his past behaviour. It is Drake's right to set a higher bar for him to reach before he lets him into his confidence.
A few days after his birthday, he overheard his most distant brother speaking to Richard.
The oldest Wayne son was arguing in Damian's favour, as he is so prone to doing to the detriment of his own relationship with Drake.
"You let Jay in and he also tried to kill you! What makes Damian different, Tim? He was a child."
"I was a child too! And Jason apologised. He showed me with his actions that it wouldn't happen again. He put in the work. He cared. And it wasn't easy either! He only reached out because I too got replaced."
It makes Damian feel ashamed just thinking about it. He can't believe he had expected Drake to simply overlook his past actions without even thinking that making amends had to start with an apology.
"So what, you won't try to have a relationship with Damian until we get a new brother? Do we need to find someone else to put in the costume for you to start making an effort with him?" had asked Richard, incredulous.
"Why am I always the one making an effort? And don't be ridiculous. Sure, the suit's a reminder of how it all went down, but I'm over that. I can't deny it helped, though, with Jason." Drake had sighed then. "I always wanted a little brother, you know? Now I'm dreading the possibility that the next stray Bruce picks out will be the one to off me permanently."
Richard tried to lighten the conversation. He didn't seem to want a full blown argument. "I don't know, maybe it will be a real baby this time? Then they won't have the strength to lift a weapon."
They spoke more, but Damian didn't feel right listening further.
The conversation left Damian quite distracted.
There was much to take from it.
He would have to properly apologise and show that he means it, of course. He couldn't believe he had been too stupid to figure it out before this.
At least he has a path forward. The other part of the discussion strikes him as more memorable. He'd never considered the possibility that he wouldn't be the last surprise child.
Father was a bleeding heart and a playboy. Sooner or later an orphan would fall into his lap or one of his paramours would announce a surprise pregnancy.
Did Bruce Wayne even take precautions?
Damian shudders. The less he knows about his father's intimate endeavours, the better. But it bears investigations nonetheless.
He has long accepted the fact that he is not his father's only son and heir. Perhaps it is time to prepare himself to the possibility that he is not the only blood son either.
And what better way to prepare than being proactive?
Damian splits his time between his duties as Robin, his awkward overtures to mend the rift between him and Drake, and his investigations into his father's past trysts.
This is how he learns that Father had a vasectomy shortly after becoming the Batman.
Which drastically reduces the chance of Damian already having half-brothers, and renders Richard's hope of a baby brother incapable of wielding weapons impossible.
Somehow, both thoughts disappoint him.
He still makes a list of the women his father had public relationships with before the procedure.
He is not surprised by Selina Kyle's presence on said list.
He is more intrigued by the story of Silver St Cloud.
The woman was from a prestigious family and frequented Gotham's high society circles. She had a whirlwind romance with Damian's father, and the Batcomputer's old file marked her as one of the few who were aware of Bruce Wayne's vigilante identity. Their romance was cut short abruptly, and Damian has become a good enough detective to understand said secret identity probably was the cause of the break-up. Then St Cloud dated another man until she reunited with Father, broke up with said man to resume their tryst, and was summarily murdered by one of Father's enemies.
Without ever telling him that she had given birth to a child a few months after their first break-up and given him away for adoption.
This, Damian finds out by doing some involved research Richard would probably scold him for.
Said involved research might not even have been needed, as Silver St Cloud's name was not censored on the birth certificate.
Bruce Wayne's only other possible blood son took an interest in his biological family at age fifteen and contacted the St Cloud family. His name was then Daniel Fenton. Following this interaction with his maternal grandparents and the presumed revelation that his biological mother was dead, he decided to shed the name of his adoptive parents and go to live with them. Damian can only assume the Fentons were inadequate caretakers.
Daniel St Cloud is now nineteen and attending university in Metropolis. He studies engineering in a reputable program, is already submitting patents with his grandparents' support and has persistently dodged LexCorp's attempts to recruit him out of school. He looks a lot like his mother, but he resembles Damian and their father too. He still maintains connections to his adoptive sister Jasmine Fenton and his social media indicates that his childhood friends see him regularly -- Tucker Foley is Daniel's college roommate and Sam Manson visits them often despite studying in Gotham, he notes with detached interest. He seems happy.
Perhaps it is too late for him to need a father. And yet.
Damian has come to learn that there is no such thing as having too much family.
Perhaps Daniel has no need for a father. Perhaps he might still want one.
Damian thinks he would like a brother who did not know him when the League still had its claws into him.
The St Clouds having not set foot in Gotham since the murder of their daughter, Damian is not entirely sure if they are aware of Daniel's connection to the Wayne family and are keeping it from him or if Silver St Cloud simply never told them who the father of her child was.
He intends to find out, but this will require making direct contact with them.
He just has to figure out how to go about it.
Luckily, he is making progress with his attempts at bonding with Timothy, who is much more adept at navigating social situations, especially among elite circles. Perhaps a joint project might help him further improve their developing relationship.