Location: Somewhere in hell, close by
Threat Assessment: 6. (Goes down as the series progress) A creature from beyond, Pinhead has his associates. Pinhead has lots of hooks. Pinhead can change space to suit him.
Limitations: He's bounded by the puzzles that allow him into this world. He likes suffering so he'll tend to overplay his hand. Also, he's very much of a visionary. He wants to show you things rather than take over the world.
Personal Note: I've always liked that Pinhead is sort of a S/M cultist going from door to door. "Pardon me Sir, but I have such sights to show you."