PJ is a Green Puffle in Club Penguin. He only appears in the real life book, The Great Puffle Switch. PJ switched bodies with his owner when they went into the Night Club. They got hit by flashing lights, which made them switch bodies. PJ is known to be quite smart, but can go haywire when extremely excited.
His owner wore a red version of the Blue Club Penguin Hoodie, which was rumored to be released in a catalog, but it didn't.