Shush

Shush, A.K.A. Experiment 234, is an illegal genetic experiment created by Jumba Jookiba. She is designed to eavesdrop on private conversations. Her one true place is as a CIA operative.

Bio
Experiment 234 was the 234th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to eavesdrop on private enemy conversations.

234 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.

Lilo & Stitch: The Series
234's pod was found by Gantu, but attempted to escape Lilo and Stitch with it. However, Lilo was able to take the pod back from Gantu. However, a pair of kids then soaked Lilo and the pod with super-soakers, activating 234.

Later, Lilo used 234, named Shush, to eavesdrop on Mertle dismissing her dolls, which Lilo mistook as a dismissal of the hula girls.

When Lilo, Stitch and Shush later went to Mertle's home to apologize, Mertle, hypnotized attacked them and paralyzed Shush. However, Lilo and Stitch were able to rescue Shush.

Shush was shortly after found a one true place with Cobra Bubbles as a CIA operative.

Leroy & Stitch
The first 624 experiments, including Shush, were round up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed.

It is unknown whether or not Shush participated in the following battle between the experiments and the Leroy clones.

The Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song Aloha Oe, which caused the Leroy army to shut down due to the original Leroy's failsafe.