Conversation so far:
what kind of personality does pinhead have?
his intended portrayal of Pinhead as an articulate and intelligent character was initially not well received by the producers.
what did they end up doing?
Barker insisted that Pinhead's personality be more evocative of Christopher Lee's portrayal of Count Dracula.
did he follow the suggestion?
Pinhead prefers using coercive methods in order to obtain his goals.
is there anything else interesting?
Pinhead can be reasoned and bargained with.

Question: does he have other weaknesses?
Self-contained rewrite: Aside from being able to reason and bargain with, does Pinhead have other weaknesses?