Pocket TOS characters
This is a list of characters who have recurring appearances or mentions in the  series of novels.

Regular characters

James T. Kirk  's CO, a Starfleet captain. After a promotion to rear admiral, Kirk served as the Chief of Starfleet Operations before returning to captain's rank as CO of  until his retirement.

Spock  Half-Vulcan Enterprise XO and science officer, a Starfleet commander.

Leonard McCoy  Enterprise CMO, a Starfleet doctor with the rank of lieutenant commander.

Montgomery Scott  Enterprise chief engineer.

Hikaru Sulu  Enterprise helmsman.

Nyota Uhura  Enterprise communications officer.

Pavel Chekov  Enterprise navigator.

Christine Chapel  Starfleet nurse assigned to the Enterprise.

Janice Rand  Yeoman assigned to the Enterprise.

Recurring characters
Merete AndrusTaurus  Starfleet doctor of the Palkeo Est species assigned to USS Enterprise. Merete became an ally to Piper during the "dreadnought" crisis and was detailed to Piper's command aboard SS Banana Republic. (Dreadnought! and Battlestations!)

Athendë  Sulmid Starfleet lieutenant.

Ael i-Mhiessan t'Rllallieu  Romulan, originally a traitor to the Romulan Star Empire, she and her crew on her starship Bloodwing became the indirect leaders of a revolution that completely changed the government of Romulus. She became the first Romulan Empress.

Samuel Boma  Former Starfleet scientist. (Dreadnought! and Battlestations!)

Lori Ciana (see unnamed Enterprise personnel)  (The Motion Picture, A Flag Full of Stars, and Recovery)

Daniel Corrigan  (The IDIC Epidemic and The Vulcan Academy Murders)

Lee Kelso

Janice Kerasus  Enterprise linguist

George Kirk( and Best Destiny)

Winona Kirk

K's't'lk  Child/creation of K't'lk. (Reappears in Spock's World, Swordhunt, Honor Blade, and The Empty Chair)

Lamia

Mahásë  Starfleet lieutenant, beta shift communications officer subordinate to Uhura.

Gary Mitchell

Doctor Joseph M'Benga (The IDIC Epidemic and The Vulcan Academy Murders)

Heihachiro Nogura

Number One

Christopher Pike

Piper  (Dreadnought! and Battlestations!)

Judd "Scanner" Sandage  (Dreadnought! and Battlestations!)

Sarda  (Dreadnought! and Battlestations!)

Sendet  (The IDIC Epidemic and The Vulcan Academy Murders)

Sorel  (The IDIC Epidemic and The Vulcan Academy Murders)

Stanger

Harb Tanzer  Chief of recreation aboard the Enterprise.

Ingrit Tomson

José Tyler

Other characters
Some characters appear in only one novel, but have also been mentioned or seen in canon. Other characters who are only in one novel appear in other non-canon publications. (See: list of non-canon characters)'' : Unnamed Federation president