Shush

Shush, A.K.A. Experiment 234, is an illegal genetic experiment created by Jumba Jookiba. She is designed to use the built-in speaker in her tail to eavesdrop on private enemy conversations; she will cease doing so if she's petted on the head. Her one true place is with Cobra Bubbles as a CIA operative. Shush is voiced by Samantha Morton.

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 in a playground where Lilo and Stitch were present. Gantu then attempted to escape with the experiment pod, but Lilo and Stitch were able to get the pod back from Gantu after a brief struggle. Unfortunately, a pair of kids then soaked Lilo and the pod with their super-soakers, activating 234.

234, named Shush, used the speaker in her tail to eavesdrop on the fleeing kids and Gantu. Lilo found this quite fascinating, so she used Shush to eavesdrop on Mrs. Hasagawa and Officer Kaihiko.

When Lilo took Shush home, the latter eavesdropped on Nani who was talking to David on the phone, to which Lilo mistook as her sister trying to insult David. After Nani cleared things up, she warned Lilo about eavesdropping on people's private conversations.

However, despite Stitch reminding her, Lilo later used Shush to eavesdrop on Mertle dismissing her dolls, which the former mistook as a dismissal of the hula girls. They believed Lilo at first when she told them about it, and shunned Mertle before taking sides, but were more strict about her always telling them what to do.

Out of anger, Mertle later teamed up with an escaped Hämsterviel on a PC screen, who talked her into catching all the other experiments in place of Gantu (who was fired for his incompetence earlier). He then put a special mind-control headband device on Mertle's head, which hypnotized her into an android.

After hanging out with the hula girls for a while, Lilo decided to go check on Mertle and took Stitch and Shush with her. They soon ran into Mrs. Edmonds, who was carrying several boxes full of Mertle's old dolls that she was giving away, thus revealing what Mertle was really talking about earlier. Lilo suddenly felt guilty about eavesdropping.

Later, Lilo, Stitch and Shush went to Mertle's house to apologize. However, Mertle attacked them and then immobilized Shush. Gantu soon intervened and attempted to recapture Shush in order to redeem himself. After a long battle, Lilo and Stitch were able to defeat Hämsterviel and rescue Shush.

Later, Jumba removed the mind-control headband from Mertle's head, which reverted her back to her normal self.

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 rounded 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 fail-safe.

Personality
Shush is meddling and secretive, and is a total oddball. She likes doing strange things and enjoys eavesdropping and spying on others. She can be kind with allies and friends, though she is a little dumb at times. She doesn't quite understand the difference between heroes or villians – she just joins the first group she sees.

She's a little high-strung and kind of quirky in behavior. However, she is a good fighter and very sneaky, so she is good to be a spy. Her one true talent is listening in on private conversations. Shush can speak a little English, and is still learning, but most of it is kind of rough.

Trivia

 * Shush's pod color is green.
 * Shush is described by the experiment computer screen as, "Experiment 234 Primary function: Eavesdropper."