From Deadly Assassin to Hero {Young Justice X Male Reader}

Y/N never had a normal childhood. That would probably be because he was taken from a young age and trained as a deadly assassin by Slade Wilson aka Deathstroke. Deathstroke took Y/n and trained him to be the most perfect assassin the world has ever seen. And with the "training" he received from Deathstroke which also included being injected with the same serum that he was given during his early days which helped Y/n in taking down multiple HVT's ranging from senators, police, politicians to even the great Batman himself. But Y/n failed in killing the Batman and thus Deathstroke brutally beat Y/n for his failure but it didn't last long as he was rescued by Batman. Batman however didn't trust the boy but he couldn't let his skills go to waste. Which is why his cousin Kate Kane aka Batwoman took Y/n under her wing and trained him how to be a hero and she even helped break the hold that Wilson had over the young boy.....or did she? And now Y/n has been welcomed into the Superhero community and was seen as a hero in the eyes of the people despite his past. However...Y/n does tend to slip and kill people who dare harm his friends.