I pretty much like the entire main cast, but I've only seen seasons 1-4 and half of season 5 so far. My favorite characters though would have to be John Carter and Lucy Knight. So who's your favorite character or characters? Here's the cast:
Mark Greene
Portrayed By: Anthony Edwards | Seasons: 1-8, 15
Doug Ross
Portrayed By: George Clooney | Seasons: 1-5 (6 & 15 as guest star)
Susan Lewis
Portrayed By: Sherry Stringfield | Seasons: 1-3, 8-12 (15 as guest star)
John Carter
Portrayed By: Noah Wyle | Seasons: 1-11, 15 (12 as guest star)
Carol Hathaway
Portrayed By: Julianna Margulies | Seasons: 1-6 (15 as guest star)
Peter Benton
Portrayed By: Eriq La Salle | Seasons 1-8 (15 as guest star)
Jing-Mei Chen
Portrayed By: Ming-Na | Seasons: 6-11 (1 as guest star)
Jeanie Boulet
Portrayed By: Gloria Reuben | Seasons: 2-6 (1 & 14 as guest star)
Kerry Weaver
Portrayed By: Laura Innes | Seasons: 3-13 (2 & 15 as guest star)
Elizabeth Corday
Portrayed By: Alex Kingston | Seasons: 4-11 (15 as guest star)
Anna Del Amico
Portrayed By: Maria Bello | Seasons: 4 (3 as guest star)
Lucy Knight
Portrayed By: Kellie Martin | Seasons: 5-6
Robert Romano
Portrayed By: Paul McCrane | Seasons: 6-10 (4-5 & 15 as guest star)
Luka Kovač
Portrayed By: Goran Visnjic | Seasons: 6-15
Abby Lockhart
Portrayed By: Maura Tierney | Seasons: 6-15
Cleo Finch
Portrayed By: Michael Michele | Seasons: 6-8
Dave Malucci
Portrayed By: Erik Palladino | Seasons: 6-8
Michael Gallant
Portrayed By: Sharif Atkins | Seasons: 8-10 (11-12 as guest star)
Greg Pratt
Portrayed By: Mekhi Phifer | 9-15 (8 as guest star)
Samantha Taggart
Portrayed By: Linda Cardellini | Seasons: 10-15
Neela Rasgotra
Portrayed By: Parminder Nagra | Seasons: 10-15
Ray Barnett
Portrayed By: Shane West | Seasons: 11-13 (15 as guest star)
Archie Morris
Portrayed By: Scott Grimes | Seasons: 12-15 (10-11 as guest star)
Tony Gates
Portrayed By: John Stamos | Seasons: 13-15 (12 as guest star)
Simon Brenner
Portrayed By: David Lyons | Seasons: 15 (14 as guest star)
Catherine Banfield
Portrayed By: Angela Bassett | Seasons: 15
Mark Greene
Portrayed By: Anthony Edwards | Seasons: 1-8, 15
Doug Ross
Portrayed By: George Clooney | Seasons: 1-5 (6 & 15 as guest star)
Susan Lewis
Portrayed By: Sherry Stringfield | Seasons: 1-3, 8-12 (15 as guest star)
John Carter
Portrayed By: Noah Wyle | Seasons: 1-11, 15 (12 as guest star)
Carol Hathaway
Portrayed By: Julianna Margulies | Seasons: 1-6 (15 as guest star)
Peter Benton
Portrayed By: Eriq La Salle | Seasons 1-8 (15 as guest star)
Jing-Mei Chen
Portrayed By: Ming-Na | Seasons: 6-11 (1 as guest star)
Jeanie Boulet
Portrayed By: Gloria Reuben | Seasons: 2-6 (1 & 14 as guest star)
Kerry Weaver
Portrayed By: Laura Innes | Seasons: 3-13 (2 & 15 as guest star)
Elizabeth Corday
Portrayed By: Alex Kingston | Seasons: 4-11 (15 as guest star)
Anna Del Amico
Portrayed By: Maria Bello | Seasons: 4 (3 as guest star)
Lucy Knight
Portrayed By: Kellie Martin | Seasons: 5-6
Robert Romano
Portrayed By: Paul McCrane | Seasons: 6-10 (4-5 & 15 as guest star)
Luka Kovač
Portrayed By: Goran Visnjic | Seasons: 6-15
Abby Lockhart
Portrayed By: Maura Tierney | Seasons: 6-15
Cleo Finch
Portrayed By: Michael Michele | Seasons: 6-8
Dave Malucci
Portrayed By: Erik Palladino | Seasons: 6-8
Michael Gallant
Portrayed By: Sharif Atkins | Seasons: 8-10 (11-12 as guest star)
Greg Pratt
Portrayed By: Mekhi Phifer | 9-15 (8 as guest star)
Samantha Taggart
Portrayed By: Linda Cardellini | Seasons: 10-15
Neela Rasgotra
Portrayed By: Parminder Nagra | Seasons: 10-15
Ray Barnett
Portrayed By: Shane West | Seasons: 11-13 (15 as guest star)
Archie Morris
Portrayed By: Scott Grimes | Seasons: 12-15 (10-11 as guest star)
Tony Gates
Portrayed By: John Stamos | Seasons: 13-15 (12 as guest star)
Simon Brenner
Portrayed By: David Lyons | Seasons: 15 (14 as guest star)
Catherine Banfield
Portrayed By: Angela Bassett | Seasons: 15