PJ, A.K.A. Experiment 133, is an illegal genetic experiment created by Jumba Jookiba. He is designed to play practical jokes on people, hence his name P(ractical) J(oker). His one true place is performing an opening act for Moses' hula gig. He is voiced by Jeff Bennett.
He was activated when a fat guy threw his pod into the ocean. In the group photo taken at the end of Leroy & Stitch, PJ is not wearing his glasses.
PJ is incredibly silly and mischievous, even towards other experiments. As an expert prankster, PJ uses his intelligence to create ingenious pranks. As Lilo describes, PJ can be annoying with his pranks and while his pranks can be mean, he himself doesn't seem purposely malicious, but merely carries out his programming. Like most experiments, he dislikes it when his goals do not carry through or are interrupted. He likes making people laugh with his practical jokes.
PJ is an orange and tan koala-like experiment with a white face and white belly, a wide mouth, red nose, black eyes, two thin yellow-tipped antennae on his head resembling rabbit-like ears, and a functioning blow-horn for a tail (reminiscent of Harpo Marx's trademark horn), which he squeaks instead of speaking. He wears joke eyeglasses with a fake nose and mustache resembling those of Groucho Marx.
PJ is a skilled practical joker. He can play practical jokes by using his surroundings as well as other things he finds.
PJ has shown to be skilled in playing the trumpet.