Eric Beale

Dominic Vail
First appearance	"Identity"
Last appearance	"Found"
Portrayed by	Adam Jamal Craig
Information
Nickname(s)	Dom
Gender	Male
Occupation	Junior Field Special Agent (NCIS)
Title	Special Agent
Nationality	American

Henrietta Lange
Linda Hunt as Henrietta "Hetty" Lange in a promotional photo for NCIS: Los Angeles season one.
First appearance	"Identity"
Portrayed by	Linda Hunt
Information
Nickname(s)	Hetty, "Duchess of deception"
Aliases	Sylvia Cole Sylvia Martin Gloria Edwards,
Gender	Female
Occupation	Operations manager (NCIS)
Title	Operations Manager, Office of Special Projects, NCIS
Nationality	American

Eric Beale
First appearance	"Legend (Part 1)" (NCIS episode)
Portrayed by	Barrett Foa
Information
Gender	Male
Occupation	Tech operator (NCIS)
Nationality	American

Marty Deeks
First appearance	"Hand-to-Hand"
Portrayed by	Eric Christian Olsen
Information
Nickname(s)	Marty
Aliases	Max Gentry
Gender	Male
Occupation	LAPD senior detective / former lawyer
Title	LAPD-NCIS liaison officer
Family	Gordon John Brandel (father; deceased) Roberta Deeks (mother)
Significant other(s)	Kensi Blye (fiancée)
Nationality	American

Nell Jones
Nell Jones promotional photo
First appearance	"Special Delivery"
Portrayed by	Renée Felice Smith
Information
Gender	Female
Occupation	Intelligence analyst
Title	NCIS intelligence analyst
Nationality	American

This is an overview of regular and recurring characters on the TV series NCIS: Los Angeles.

G. Callen (portrayed by Chris O'Donnell) is a Special Agent in Charge assigned to the NCIS Office of Special Projects.

Dr. Nate Getz (portrayed by Peter Cambor) is an operational psychologist working with NCIS, stationed in Los Angeles, introduced in the series' backdoor pilot, "Legend" from NCIS. Nate's specialty is psychology, and he holds both a master's degree and Ph.D. in the field. He states in the episode "Callen, G" that he was abducted by aliens as a child.

He observes surveillance tapes and watches/handles interrogations in order to make a psychological profile. He is also responsible for performing periodic psychological evaluations of the NCIS OSP personnel and to provide ongoing monitoring of their mental health. He is afraid of disobeying orders from Hetty Lange and finds her scary. The team often fails to get his humor, for example, in "The Only Easy Day" when he states: "What has the world come to when drug dealers aren't even safe within the comfort of their own fortified homes?". He also knows how to play banjo and harmonica, and enjoys listening to jazz music.

In the episode "Chinatown", Nate expresses his interest in becoming a field agent which is highly discouraged by the team members because of his inept field skills. He asks Hetty if she can think of any operational psychologist who has become a field agent; however, when she shares that the only known such person died on his second week of field work, Nate gets a little iffy about his choice. Despite this, Nate has received training in both fieldcraft and hand-to-hand combat, as demonstrated on several occasions in the episodes "Lockup" and "Harm's Way".

Nate and recurring character Rose Shwartz share an unconsummated mutual attraction. This has not been explored further as Peter Cambor is no longer a member of the main cast. Cambor's departure as a main cast member coincides with Nate's reassignment to the Middle East to investigate an Islamic militant group based in Yemen. With the conclusion of that mission in the episode "Harm's Way", Nate's current assignment is undisclosed, although it is known that he is remaining in the Middle East for the time being.

Nate returned to Los Angeles in "Patriot Acts" where he helped the team locate a domestic terrorist responsible for planting a bomb somewhere in the city. In "The 3rd Choir" he helps Nell to cope with her first kill.