Stealth Robin, Shadow Robin, Ninja Robin...? I don't know.
It's just a Teen Titans Robin action figure cast in all black. Only the whites of his eyes are painted...well...white. It would be cooler if his skin was painted so it would be an all black costume, but if I wanted I could paint him I suppose.
I'm sure there was a reason for this figure, but I didn't follow the Teen Titans cartoon or the toyline closely enough to know on sight. I found this guy a while back at the flea market and had to have him though. He's odd and cool and Robin is a great character so he's in my collection now!