Agatha

Agatha is a character who first appeared slightly before Darth Vader's arrival. She is currently on the Light Side, and has been known to beat people with picnic boxes a lot. She's also the one who discovered The Black Book.

She eventually vanished for a while, but returned, having brought Timmy back to the Light Side.

Trivia

 * Agatha is probably based on Agitha from the Legend of Zelda, given the similar names, and Ablite stating that "Agatha" is from Zelda. However, because of the misspelling, Agatha is not the same as Agitha, much like Edgar is not Egbert.
 * This means it's not just original characters that get "cloned" through misspellings.