Sha'a Gi was a Human male from the planet Ord Biniir. As a child, his Force-sensitivity was discovered by Jedi Master Daakman Barrek. Taking Gi as his Padawan, Barrek accompanied him to Coruscant so that the youth could begin his training as a Jedi.
In the audio commentary included on the Star Wars: Clone Wars Volume One DVD, director Genndy Tartakovsky states that the Human Jedi featured in Chapter 20 was inspired by the character Shaggy Rogers from the Scooby-Doo cartoons. This resulted in a similar appearance to that character.
thanks wookiepedia
