Jack is a retired character in New Looney Tunes.
Jack is an overweight, tall man with short brown hair. He wears a white shirt and a black jacket.
- "'Jack was one of the first new characters created for the series. The idea was that Jack was, well, a “jack” of all trades, but a master of none. Every time you’d see him in a new cartoon, he’d have a different profession (a painter, a dog trainer, etc.), but he’d be terrible at it, to the point he’d get frustrated and lash out, usually at Bugs. But in a way, Jack wasn’t a really great foil for Bugs. He screamed a lot, had a short temper and was really easy for Bugs to outsmart… and we realized that we already had a character with almost the same exact personality traits: Yosemite Sam. What was the point of using this guy when we already had a strong, well-established character like Sam to utilize? So after this short [Painter Paint Hare], we phased out the character. So long, Jack!'"
As quoted above by storyboard artist Michael J. Ruoco, the reason behind Jack's retirement from the series is due to his similarities in personality to Bugs' more famous antagonist Yosemite Sam.