Sparky (Experiment 221)

Experiment 221, better known as Sparky (voiced by Frank Welker), is a genetically created alien experiment. He resembles a small light yellow Chinese Dragon/Monkey/Gecko-like creature with a small body, skinny arms, stubby legs, twisted tail, an oval-shaped head, a pair of dark blue eyes, two triangular ears and a pair of long slender antennas. His body can turn into a lighting bolt, allowing him to easily fly or travel though outlets, power lines and machines. He was the first experiment that Lilo and Stitch turned from bad to good and first appeared in Stitch!: The Movie. His own true place is powering the old lighthouse that had abandoned for requiring too much electricity, though he offers Stitch aid.

Trivia

 * Sparky will appear in a episode of Jeffrey & Friends' Adventures Chronicles.