Joy, A.K.A. Experiment 495, is an illegal genetic experiment created by Jumba Jookiba. She is designed to neutralize hostile targets. (Does so by creating a halo of positive energy that she shoots at her target making them unbelievably nice and cooperative). Her one true place is in the Kokaua Town prison making the inmates get along.
Experiment 495 was the 495th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to neutralize hostile targets.
495 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
At the unknown point, she was activated, captured, tamed and named Joy.
Joy is a white angel-like experiment with a halo.