Special Agent Jethro Gibbs played by Mark Harmon
Special Agent Anthony DiNozzo played by Michael Weatherly
Special Agent Tomothy McGee (also gets called Probie) played by Sean Murray
Officer Ziva David played by Cote de Pablo
Abby Sciuto played by Pailey Perrette
Dr. Donald 'Ducky' Mallard played by David McCallum
all of them
Cate
No. All the main characters - Gibbs, Tony, Ziva, McGee, Abby, Ducky, Vance are going to be part of NCIS Season 9
Tony Dinozzo joined NCIS right from the beginning. He is one of the 3 characters (with Gibbs and Abby) to have appeared in every episode of NCIS that has aired till date
Ogio Kirby Mountainsmith I.T.Z
all of them
Cate
No. All the main characters - Gibbs, Tony, Ziva, McGee, Abby, Ducky, Vance are going to be part of NCIS Season 9
Tony Dinozzo joined NCIS right from the beginning. He is one of the 3 characters (with Gibbs and Abby) to have appeared in every episode of NCIS that has aired till date
Some old characters are 1. Special agent Kate Todd 2. Special agent Mike Franks 3. Director Jenny Shepard All these 3 characters died during the course of the various NCIS seasons
Ogio Kirby Mountainsmith I.T.Z
None. Gibbs and DiNozzo are the two characters who have been present in every single episode of NCIS that has aired till date.
The name of his character in NCIS Los Angeles is G Callen. His real name is Chris O'Donnell. He is the head of the NCIS team in Los Angeles and reports to Hetty. He is similar to the Gibbs character in original NCIS but isn't so senior to the other characters. So, he shares a friendly kind of rapport with other characters.
he is only a reoccurring cast member.
Katie and Micah Sloat
no names can be up to 64 characters in length.
There is a book series that started with NCIS but it is not the same characters from the show and in my opinion the books didn't read well, they were very boring and sounded more like a crime documentary.