Only Peter can see Jacob, so either he is just hallucinations caused by Peter’s drug abuse, or he is real and only showing himself to Peter. You can choose which one you like the best.
Jacob is supposed to be an odd mix of Christian, Buddhist and Hindu demons because those are the religions Peter was inspired by when he created his cult.
Jacob's voice sounds like this http://www.youtube.com/watch?v=SiUTfk3pkII
@Mutterscrawl Peter is from another comic by Humon, Niels and Gang. He's some sort of a psycho who has started a religious cult. His hobbies include for example creeping and raping. I strongly recommend! Link to the comic is right there, on the top of the page.
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This comic looks very awesome!