Will & Grace

A "camp" gay man, Jack has always had a passion for acting and the theatre, although his friends, amongst others, doubt his abilities in this area. Very mercurial, he changes careers rapidly from cater waiter, Banana Republic and Barneys New York sales clerk, to acting teacher, to student nurse, to surfer, to back-up dancer for Jennifer Lopez and Janet Jackson. Although he considers all his relationships serious, only one lasted longer than a few weeks (with Stuart, a client of Will's played by Dave Foley), and even that one ended with Jack's cheating.

Jack is unashamedly vain and self-absorbed, with an adoration of all gay icons, particularly Cher, of whom he has a rare doll. (He met her once in the episode "Gypsies, Tramps and Weed", although he mistook her for a drag queen and declared, "You're not that great, Mr. Sister. I do a better Cher than you." It was only when she slapped him and exclaimed "Snap out of it!" that he realized and promptly fainted.) He would also meet Cher in a dream where she appeared as God (complete with an entourage of "dancing fairies"). When Jack asked her if she was God, Cher replied, "That depends on what bathhouse you pray at." He is a fan of Buffy the Vampire Slayer, particularly lesbian character Willow Rosenberg. He also collects clippings of celebrities' hair, including a complete collection from the four main actresses on The Golden Girls, as well as Broadway icons Bernadette Peters, Betty Buckley, Idina Menzel, and — as of season seven — Patti LuPone. Jack also stalks actor Kevin Bacon. At one point, he is Kevin's assistant. He then finds out that the only reason Kevin got an assistant is to help him find his stalker. Jack has to be Kevin's assistant and continue stalking him or he'll lose his job. Jack and Will stalk Kevin, so Kevin thinks Will is his stalker. Kevin then invites Will in, and they end up dancing to "Footloose" together. Jack walks on in them dancing and is angry because he was supposed to dance with Kevin.

He is also decidedly hyperactive and air-headed, causing Will to once refer to him as "Jumping Ferret Jack," and another time thinking that he had set Will and himself up on dates with twins, but soon realizing, after Will asks him if, it was just one guy taking his glasses on and off. Strangely, he believes in gay rights, but absolutely hates lesbians to the point of having harassed their friends Terry and Annie ("Starsky and Butch?!" Jack exclaims) during practice for a gay-sensitivity skit, requested that their parts be played by men, and only referred to them as "the lesbians" the whole time, even to their faces. His general feelings about gay rights seem to be shallow at times, like when a kiss between two men on a television show he liked was not shown, he asked Will "What about our Constitutional right to see two hotties get it on?" (to which Will replied "Would that be the Constitution that begins 'Wheeeee, the people'?"), but his intentions are essentially good. Most often though, his good intentions usually are provoked out of the desire to be good to his friends, such as when he used all his nest-egg money to save a pair of gay penguins at the zoo in order to make Will happy.