Over the decades, stories starring Nightwing and various incarnations of Batgirl have established them as one of the best partnerships in Batman comics, second only to the bond between Batman and Robin. As two of Batman's most popular foot soldiers in his never-ending war on crime, the two mantles work together as a duo in some of DC Comics' best stories.
Source：https://www.cbr.com/batgirl-nightwing-dc-comics-best-team-ups/
