It's a wild-eyed man with an unkempt beard, a raspy voice and an oddly, smelly filthy brown and purple garment made out of some special fabric and possesses plasma burns and scorch marks all over it. His left eye looks like it's about ready to jump out of his head.
He seems to work for some mysterious person that he calls "my agent". If he is alive at the end of the questions and responded well to the player, he wants to change jobs because of the non-respect for his person and getting into car repair, saying "I hear that is where all the money is made these days".
The Bridgekeeper ask you three questions to try to cross the bridge to he is the guardian. One mistake on your part and you die. If the player has sufficient intelligence, they can ask him a question during his third question, which will kill automatically.
If you have less than 4 in Intelligence, the conversation will be extremely confusing, but you can still answer questions. The Bridgekeeper will ask you only two questions and help you greatly for the 2nd, giving you the answer in the question. Also, it's the only type of character that can kill the Bridgekeeper directly to the 1st question, asking him his name.