Checkers

Checkers, A.K.A. Experiment 029, is an illegal genetic experiment created by Jumba Jookiba. He is designed to make his wearer a supreme ruler. His one true place, once he became reprogrammed, is as a decorative crown for certain luaus.

Bio
Experiment 029 was the 29th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to make his wearer a king or queen by hypnotizing those around them to worship them as royalty.

029 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
Experiment 029 was activated off screen and chased through Kokaua Town by Captain Gantu before being rescued by Lilo and Stitch and taken home.

When Lilo discovered 029's power, she, after naming him Checkers, put him on and thus became a queen.

However, when the hula girls began arresting many people including Pleakley, Lilo removed Checkers and decided to find his one true place. However, at that moment, Gantu arrived and grabbed Checkers and put him on, thus becoming a king.

Later, Stitch and an army of several other experiments rebelled against Gantu, and were able to remove Checkers from his head. Gantu's ex-servants revolted against him as a result, and Lilo and Stitch searched for Checkers' one true place.

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

Checkers 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.