Rare Studio Director Gregg Mayles revealed today that there was suppose to be a ‘sister’ title to Perfect Dark called Velvet Dark. In Perfect Dark, the protagonist–Joanna Dark, who goes by the name Perfect Dark–seems to have a sister named Velvet. This is the character players assume the role of in the game’s co-op mode.
Unfortunately, Mayles didn’t reveal any additional information about the game, except for the picture posted above. Although it’s most likely that the game was would’ve been released on Nintendo 64.