Rosario is Karen's feisty Salvadoran maid. She married Jack to get her green card; the two lived in the help's quarters of Karen and Stan's penthouse until Rosario divorced Jack to be with Gardener.
Episodes : 01.22, 02.01, 02.02, 02.05, 02.12, 02.17, 02.18, 02.23, 03.01, 03.02, 03.03, 03.08, 03.11, 03.15, 03.22, 04.01, 04.04, 04.07, 04.08, 04.09, 04.13, 04.16, 04.25, 05.02, 05.06, 05.08, 05.09, 05.10, 05.16, 05.18, 05.22, 05.23, 05.24, 06.01, 06.14, 06.15, 06.16, 06.17, 06.22, 06.23, 07.04, 07.05, 07.11, 07.13, 07.14, 07.16, 07.17, 07.19, 07.22, 07.23, 08.01, 08.02, 08.05, 08.06, 08.10, 08.11, 08.12, 08.15, 08.18, 08.22, 08.23
Shelley Morrison became a regular cast member in Season 3.
Dr. Marvin "Leo" Markus, a sexy Jewish doctor, falls for Grace — ruining her and Will's plans to have a baby. After a two-month romance, Leo and Grace impulsively wed. Leo and Grace lived in Leo's apartment in Brooklyn.
* #07.08: voice only
Ellen is Grace's friend and was also her college roommate. She often comes over for dinner and games with her husband, Rob. Rob and Ellen haven't been seen much since they got married and moved to New Jersey. Ellen had a baby boy in 2002, and by 2005 had three children.
Larry and his partner Joe are two former party boy friends of Will and Jack's. They settled down in the South Hamptons and are raising a daughter, Hannah. They were married in 2001 in Vermont. Grace fixed him up with Will's father's mistress.
Rob is one of Will's friends who comes over for dinner, and to play poker and other games, like the home version of Pyramid, along with his wife Ellen. (They constantly lose to Will and Grace.) Rob and Ellen have two dogs, Harry and Ronnie, and three kids. Rob is also Will's accountant.
After trying to steal Rosario and then showing up at the Walker's annual Valentine's weekend to taunt Karen for being alone, Karen's arch-rival showed up at the HRC gala with "business associate" Benji and tried to outbid her in the silent auction. He was in Vegas for Karen's wedding and confessed to Will that Karen Walker was "the one who got away." His rich wife Crystal finally passed in 2005.
Will's mother, married to George Truman. They have three sons: Sam, Paul, and Will (her favorite). George and Marilyn decided to divorce in 2002. After the divorce became final in 2003, she became depressed and moved in with Will. After spraining her ankle, she was forced to stay with Will for a couple more weeks. In 2004, she invited Grace to her house for a tea party and Grace broke her favorite Lladro figurine.
Will meets Vince by coincidence when Vince stops Will and Karen for speeding. Vince is friends with Joe and Larry, and they have been trying to set up Will and Vince for years. Will and Vince soon began dating.
Elliot is Jack's biological son. Elliot's mother Bonnie used Jack's donation from the New York Family Clinic back in 1988. When Elliot was 12, he tracked down Jack. Desperate for Jack's attention, Elliot tried out for his high school cheerleading squad in 2004.
Michael Angarano became a regular cast member in Season 4 (but only appeared in one episode each in Seasons 5, 6, and 8).
Bobbi is Grace's critical, over the top, poker-playing, match-making, show girl mother. Bobbi is married to Martin Adler, and they have three daughters: Janet (the oldest), Grace and Joyce.
Wacky neighbor Val moved into apartment 15F and befriended Will (which made Grace crazy jealous). She then moved to 12E and befriended Grace (then stole her music box). After seeing Jack's cabaret act Jack 2001, Val stalked him. When Val shows up again and tries to be friendly with Grace, Grace gives her the cold shoulder. To get back at her, Val opens a design business next door and steals Grace's ideas and clients. In 2004, Grace ran into Val at an AA meeting.
Benji was Beverley Leslie's longtime "business associate". Beverley replaced "Original Benji" with "New Benji" because he was too old.
Extra Brian A. Setzer was uncredited for the role of Benji until episode #7.22. He didn't speak until #8.07.
Zandra Zoggin is Acting Teacher Extraordinario. Jack brings Will to Zandra's "Acting On-Camera" class where Will lets his emotions flow and overcomes his fear of speaking on camera. After 5 years, Zandra finally tells Jack to get out. He defects from her class to start "The McFarland Method."
Martin is Grace's joking father. He is married to Bobbi Adler, and they have three daughters: Janet (the oldest), Grace and Joyce. He missed Grace's wedding when he threw his back out.
Martin was played by Alan Arkin in the original series run
Gary is an attorney at the Law Offices of Doucette and Stein. He accuses Will of kissing Mr. Stein's ass, while also playing tennis with the partners behind Will's back. His wife's name is Nicole. He competed with Will for a promotion to partner in 2005.
Connie is an administrative assistant at the offices of Doucette and Stein, and works with Will. Seemingly oblivious to the fact that Will is gay, Connie has the hots for him and usually ends up putting her foot in her mouth when she talks to him.
Kari Lizer is one of the show's writer/producers.
George is Will, Sam, and Paul's father. Will finds out that George had told all of his friends and co-workers that Will and Grace are married. George has been having a long-term affair with Tina. George and Marilyn decided to divorce in 2002.
Will meets James when he shows up to the wrong theater. The two seemed to hit it off, but Will left to meet Grace. James later went looking for Will, but missed him. After learning that James is about to be deported to Canada, Grace proposes to him so that he can get a green card. The marriage is annulled the day after their wedding.
Joanne was the star pupil in Jack's acting class. After Jack teaches her to be an "attractress," she gets her first part in a toothpaste commercial. With Jack's help, she has become a TV commercial actress for products such as Imodium-AD, Monostat 7....