Early reports that Fillion was playing the character Arm-Fall-Off-Boy have been denied, but some rumors have claimed that TDK actually stands for The Detachable Kid, implying a similar powerset for the character.
Nathan Fillion is another of James Gunn’s personal rogues’ gallery.
Little is known about the character he’s even playing, simply known as TDK.
He tends to fair a bit better than Michael Rooker when it comes to surviving James Gunn movies, but only slightly.