I don't actually have a physical appearance.
this is true. Jib does not actually LOOK like a person. he's more like a semi visible phantom that you can only see from the corner of your eye. and yet, even though he doesnt possess a physical form per se, his presence is so strong that when light enters his "body" it refracts creating a prismatic effect that you and I call a "rainbow".
Some say this is caused by the ultra-gay-homosexuality... and that to come in contact with him would instantly turn you gay.
Some say that his genitals are on upside down... and that he has webbed buttocks...
All we know for sure is that he is called Jib.