In several discussion threads we've talked about one of the consistent problems in all Nightwing runs and that is consistent use of rogues for him to face off against.
There have been a few interesting villains introduced in the Nightwing books... Raptor, William Cobb, Shrike, Marionette... to name a few, but what about underutilized rogues in other galleries? Villains that with a fresh approach by a talented writer could be made into an excellent foil for Dick Grayson, kind of like Prankster during Higgins run and Professor Pyg and the Circus of Crime during the BatDick run?
From Batman I could see poaching Black Spider, Catman, Calculator, Electrocutioner and Tiger Shark.
From Superman Prankster and Riot
From Wonder Woman Angle Man and a reimagined Captain Wonder
From Aquaman Blackjack and Siren
From Green Lantern Gambler, Icicle, and Sportsmaster
From the Flash Suit and Thorn
Others Clock King, Jinx, Nightshade, Roulette, and Shimmer