Yaarp

Yaarp, A.K.A. Experiment 613, is an illegal genetic experiment created by Jumba Jookiba. He is designed to create devastating sonic blasts from his megaphone-like head. His one true place is at Lilo's hula school.

Bio
Experiment 613 was the 613th experiment to be created.

613 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, with 613's pod landing in Mrs. Hasagawa's fruit.

Lilo & Stitch: The Series
When Mrs. Hasagawa watered her fruit, 613's pod got wet, activating the experiment.

613 then proceeded to cause mass chaos using his destructive soundwaves.

When 613 was chased by Gantu to a store, the former was captured, but freed by Stitch, unintentionally allowing 613 to escape.

613 retreated to a cave, where he was discovered by Pleakley. However, when Pleakley unintentionally blasted 613, the latter retaliated using a massive shockwave. However, 613 was then saved from a cave-in by Pleakley, who christened him Yaarp.

As part of a set-up, Yaarp was taken to the local museum or a ransom exchange. However (as planned), when Gantu removed his earplugs, Yaarp created a shockwave which set off the alarm and forced Gantu to flee.

Yaarp was shortly after given a one true place as an alarm at Lilo's hula school.

Yaarp reappeared in "Spike" for the Ohana-Rama.

Leroy & Stitch
The first 624 experiments, including Yaarp, 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 Yaarp participated in the following battle between the experiments and the Leroy clones.

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