This article lists characters in the various canonical incarnations of Star Trek. This includes fictional major characters and fictional minor characters created for Star Trek, fictional characters not originally created for Star Trek, and real-life persons appearing in a fictional manner, such as holodeck recreations.
Bajoran characters are listed by family name, which is stated first. Joined Trills are listed by the name of the symbiont, which replaces the family name.
Cardassian male; father of a Cardassian young woman who went undercover as a Bajoran. As a young man, Ghemor played a role in the Kiessa massacre. After an attempt to pass Kira Nerys as his long lost daughter fails, Ghemor grew close to Kira and considers her the closest thing to family
Xindi arboreal. Chief technician of a facility that manufactured kemocite, power source for Xindi weapon against Earth. Changed his allegiance and helped Captain Archer's mission.
A being from Kelva, of the Andromeda Galaxy, transformed into a pale, human male. A band of Kelvans seized the U.S.S. Enterprise. Unfamiliar with human feelings, an injection of formazine stimulant drove Hanar to distraction
Borg drone rescued by Beverly Crusher from a crashed ship in the Argolis Cluster. Defected from Lore and assisted the Enterprise crew when he proclaimed himself their leader
Mother of Quark and Rom, who call her "Moogie". An unorthodox female, she flouted Ferengi law by wearing clothes and earning profit. Later married Grand Nagus Zek and influenced his reforms.
Captain of the Enterprise-D while Jean-Luc Picard was engaged in an undercover mission on Celtris III, a Cardassian planet. Recurring character in New Frontier and other novels as Admiral Jellico
An empathic metamorph from Krios Prime. Since her birth, she was intended to be Valtese Chancellor Alrik's Kriosian peace bride in an effort to reunite the two planets
Legendary Klingon commander whose exploits ensured him a place in the Hall of Heroes, as told in G'Trok's poem 'The Fall of Kang', an epic so important it is required reading at Starfleet Academy. The late Dahar Master once faced James Kirk in 2269 but joined him to defeat their true enemy, an energy lifeform living off their shared hatred when trapped aboard a starship as undying fodder. He had also squared off against Capt. Sulu's Excelsior during the tensions of the Khitomer Conference in 2293. Kang had already met Curzon Dax by then on the Klingon Korvat colony, when Dax intentionally angered Kang to foster a bond a calculated risk as he walked out during a long diatribe by the shocked Klingon. The Trill envoy became such a trusted family friend that Kang's firstborn, his son, was made his godson and named Dax in his honor. The boy, of course, was among those later killed in revenge by the marauding Albino and fostered a blood oath of revenge in turn among Kor, Koloth and Dax that was finally carried out in 2370 and led to Kang's death as he struck the death blow on his enemy. He also had defeated T'nag and his army with only colleagues Kor and Koloth, according to Kor's tale in 2372, and later feasted on the leader's heart. He had already bemoaned the passing of the old Klingon ways, and ridiculed Klingon restaurateurs like the one on DS9
In 1930, during the first part of Earth's 20th Century, Keeler was a social worker who died in a street accident. Centuries later, during a survey of the Guardian of Forever by the U.S.S. Enterprise, the ship's Chief Medical Officer, Dr. Leonard McCoy, during a temporary bout of mental illness brought on by an accidental injection of cordrazine, escaped into Earth's past. While there, he saved Keeler from dying, which sparked a chain of events throughout the timeline, essentially changing history. In the altered timeline, Keeler, a passionate believer in peace, spearheaded a movement which delayed the entry of the United States into World War II, thus paving the way for an Axis victory. Ultimately, Starfleet, the Federation and the U.S.S. Enterprise were no longer in existence, but the proximity to the Guardian of Forever by the landing party allowed Captain James T. Kirk and First Officer Spock to follow McCoy into the past. Kirk and Spock were able to prevent McCoy from saving Keeler's life, thus restoring the timeline. These events were particularly trying for Kirk, as he had fallen in love with Keeler
A Vorta field commander who sacrificed his Jem'Hadar troops to save his own life. He was later killed by inept Ferengi as they tried to trade him back to the Dominion for Quark's mother
Governor of Tarsus IV, who engaged in a large-scale eugenics programme to counter impending threat of starvation to the colony, later assumed the role of an actor leading a traveling Shakespeare company
One of two Ferengi stranded in the Delta Quadrant after attempting to secure the Barzan wormhole for themselves. Crash-landing on the Takaran homeworld, they insinuated themselves to be the Holy Sages prophesied by the Takaran "Song of the Sages" in order to exploit the Takarans for profit
The first Klingon to appear in Star Trek, as an antagonist to Kirk. John Colicos reprised the role in three Deep Space Nine episodes, as an ally and friend of Dax. James Doohan voiced the character in an animated episode.
Enaran woman in a star-crossed romance with a primitive regressive. She eventually passed on the memories of the genocide of the regressives to B'Elanna Torres.
Vulcan architect. T'Pol deferred her long-arranged marriage to Koss in order to continue her assignment aboard Enterprise NX-01. They finally wed three years later, but Koss dissolved the marriage.
DS9
Klingon who accidentally died at Quark's bar. The financial assets of his House were being siphoned off by the Duras family by using Ferengi-like tactics
Flag officer in Starfleet. She was briefly married to fellow admiral James T. Kirk. While on a trip to the Enterprise to visit him, she was killed in a transporter accident
Operator of a station inside an inversion nebula. When Voyager passed by, she created a human version of herself in Neelix's holographic resort program
Xenologist dedicated to the study of the Crystalline Entity. After the entity destroyed all life on the Omicron Theta science colony, including her son, in 2338 she became obsessed. When the Enterprise-D encountered the entity in the episode Silicon Avatar in the year 2368 she shattered it with high intensity energy waves.
TOS
Inventor of the Genesis Device, mother of Kirk's only known son
TOS
Son of James T. Kirk and Carol Marcus. Worked on developing the Genesis Device. Killed by Klingons on the Genesis Planet.
Ship's navigator who receives enhanced ESP powers from a magnetic storm as the Enterprise attempts to leave the galaxy
TNG
Father of Worf and his brother, Kurn. Accused by Duras of betraying the Klingon colony on Khitomer to the Romulans, when in fact the betrayal was committed by Duras' father. Worf nevertheless accepted discommendation for his father's crime to prevent a scandal.
Cardassian doctor, cured the Fostossa virus by experimenting on Bajorans. When B'Elanna Torres was invaded by a cytoplasmic lifeform, the Voyager EMH was assisted by a holographic reproduction of Dr. Moset, and the procedure was a success. But because Maquis crewmembers objected to Dr. Moset, the EMH decided to delete the program.
Full name: Harcourt Fenton Mudd. A confidence trickster, he was the only non-crew character to be featured in more than one episode of the original series.
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