This is my first post so forgive me for spelling errors and/or any other mishaps.
There are three things the new-52 Nightwing needs to be A-list: Swagger, Mythology, and Exposure Outside of Comics
Nightwing as a character needs swagger. In the New-52, while he hasn't been put in too many situations where you could see a true Nightwing swagger, he hasn't shown much of it. What I mean by swagger is that confidence he has from years of training and the cockiness that just comes with being Nightwing.
Then of course there is the costume. The new Brett Booth one is amazing (except for the fact that it's red and doesn't have his symbol). While it solves most of the problems he has it needs to stay long enough to become iconic. Then there needs to be an incorporation of his symbol. If it was me it would be added to the stripe of the chest. It wouldn't be touching the rest of the stripe and the holes would be filled in with red (blue if they keep the red costume) and there would be a red outline on the rest of the stripe, all the way down to the finger stripes.
The last thing when it comes to swagger is the fact that it's time for the mane to go. I know I might get a lot of flack for this, but it needs to be cleaner, something like the Injustice model, but with a little more volume.
This is the biggest issue. Everything Dick's ever had has been torn down when it was convenient for a batman story (Haly's Circus and Bludhaven (probably spelled that wrong)). He need's his own supporting cast, which he'll probably get in Chicago, and they should bring back the years when he was a police officer, something that would put a good bit of distance between him and Bruce. He also needs a nemesis, one he can call all his own. Not Deathstroke, he could almost be called Green Arrow's Nemesis and Blockbuster just doesn't work. There is no one in the new-52 so that is a major area to address. He needs to stop being defined as "Oh he used to be robin"
Exposure Outside of Comics
He need's a tv show, a movie, a game, and an animated tv show. I also believe that when the new Justice League movie comes out he should take Batman's place. Bruce has been in to many movies, what if they got it wrong for the JL movie. Use Christian Bale to cameo and put Nightwing in his place
That's it. Thanks for reading.