Jib Jib, Tengu of Prophecy, lives in the forests of the Roof of the World, though he will not approach the Reflected City (as he says that they don't like annoying people there). He accompanied Hiro through many of the events in A New Shadow. For suitable payment (e.g. plum wine) he will assist you in prophesying on a subject of your choice. (Lie down and pretend to sleep, spend tao, recite a prophecy.) These prophecies may be false. He thinks the party has a lot of cool prophecies they get to play with.
Jib Jib can also influence a prophecy (or a curse) to make it more true or more false, though he can't always choose which way that will go.