I have found a total of 20 different aliases that were used at sometime in Robin's future. Some of them are from Elseworld stories, sometimes they were never used but mentioned. I wonder if there are any more, I will list what I have, and please tell me if there is any others, and give me a reference. My Robin Names Batboy, mentioned as a possible name in the movie Batman Forever
Batman, has taken on the name twice
Bucky, during a Batman/Captain America crossover where they had Robin & Bucky switch rolls.
Deathwing, Team Titans
Doctor Fate, during Flashpint
Heatwave 2.0, Gotham Underground #4
Hood, All-Star Batman & Robin #8
Hush Beyond, Batman Beyond
the Joker, The Dark Knight Strikes Again
Moonwing, Bruce Wayne Agent of SHIELD, A combination of Nightwing & Moon Knight
Nightwing, his current
Owlman, Batman #107, I just founf out about this one
Red Robin, Kingdom Come
Red X, Teen Titans X
Redblade, Batman: Leatherwing
Renegade, during Infinite Crisis
Robin, his original
Superman Jr., Superman's Girlfriend, Lois Lane #6, done as a prank on Superman
the Target, Nightwing: The Target.
Nightwing is my number one favorite superhero, and that's the main reason why I am interested in ALL of his aliases. So please, if you know of more, let me know.