Squeak

Squeak, A.K.A. Experiment 110, is an illegal genetic experiment created by Jumba Jookiba. He is designed to annoy entire populations with his non-stop talking. His one true place is with Mertle and as a sports referee. Squeak is voiced by Rob Paulsen.

Bio
Experiment 110 was the 110th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to irritate people and entire planets by talking non-stop constantly.

110 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 an unknown point, Experiment 110 was activated and captured by Jumba.

Lilo & Stitch: The Series
In "Spike," Jumba tested a reprogramming device on 110, named Squeak at some point, without success. Even Pleakley was driven insane by Squeak's endless jabbering, and begged him to stop talking.

In "Remmy," Squeak was one of the experiments in Lilo's dream.

Like several other "extra" experiments (only seen in other episodes and movies without having one of their own), his one true place is unknown, although it has been implied that he was given to Mertle as a pet by Lilo, and he's a sports referee.

Leroy & Stitch
The first 624 experiments, including Squeak, 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.

Squeak participated in the following battle between the experiments and the Leroy clones, but was threatened by Leroy's plasma gun when Squeak wouldn't stop talking. He also made a referee whistle sound when Kixx punched a Leroy clone over one of the stadium's goalposts.

However, 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.

Stitch! anime
Squeak has made three appearances in the Stitch! anime. Once in the second season and twice in the third season where he was with Shrink, Clip, Nosox, and Retro.

In the second season episode, "Hämsterviel's Epic Secret", he was captured by Hämsterviel, but was kicked out and blasted to Earth along with Frenchfry, Pix, Tickle-Tummy, and Houdini for being practically useless. However, unbeknownst to Hämsterviel, Squeak took a silent revenge by stealing a purple treasure chest containing one of Hämsterviel's most personal possessions...

Later, the rejected experiments were brought to Yuna's home after being captured by Stitch. Squeak, being the only one of the five that could speak normal English, explained that they were captured by Hämsterviel, but left due to the horrible working conditions. However, Jumba doubts that he would've just let them go, so Squeak admits thats he kicked them out.

After that, the experiments go into training to learn how to fight. However, Tigerlily easily beat them. Squeak then said that they're just not fighters. Yuna then got the idea to find the experiments homes on the island that make use of their seemingly useless powers. While they did this, Squeak gave Hämsterviel's treasure chest to BooGoo for safekeeping.

Eventually, Squeak is the only experiment who hasn't found a home yet. He, Stitch, and Yuna sit on the beach trying to think of something while Squeak rambles on about the ocean. Eventually, Stitch built a giant sand castle around him to keep him quiet. However, Penny then comes and demands that Stitch and Yuna leave "her" beach (It's not, though she claims it will be) before she puts them to work in her father's pineapple factory. Squeak then runs out of the sand castle, claiming he loves pineapple. He and Penny start a conversation, and walk off. Yuna and Stitch are then satisfied that Squeak has found a home.

Trivia

 * Squeak resembles Sniffles from Merrie Melodies.
 * Squeak talks in a high-pitched squeaky voice, hence his name.
 * Squeak's pod color is red.