Deathstroke, that is.
This is "Blade Attack Deathstroke" from the Dark Knight movie action figure line by Mattel.
Deathstroke, like Firefly, did not actually appear in the movie. But the toymakers decided he'd make a cool "realistic" villain for your Batman action figure to do battle with, and I must concur.
This guy is clearly an assassin. And a well armed one at that. There is little to connect this figure to Deathstroke's comic counterpart besides the the orange and blue hood, but for some reason it really works, and he actually comes across as much more mysterious and threatening than the comic book Slade Wilson.
You can see his "action feature" button on his back, which is rather large but darkly colored so as not to "stick out" too much. It becomes slightly less obtrusive when he has his sheath attached too.
Oh yeah, and there's the "one eye" thing going on too. Cool.
Slade here is, as always, well armed. However his pistol, bandoleer and knife are not removable. That's fine - less pieces to lose. They are well sculpted and nicely painted and stand out well on the figure, as do his shiny leather gloves and boots.
The sword (and sheath) are removable, and the button I mentioned earler makes Mr. Wilson's sword-holding arm flail in a hacking motion.
Ree! Ree! Ree! Ree! Cha! Cha! Cha! Cha!