Played by: Nicole deBoer
Name before joining: Ezri Tigan
Species: Trill (joined; 9th host of the Dax symbiont)
Rank/title: Ensign until "Aftermath"; Lieutenant thereafter
Birthplace or childhood home: planet in the Sappora system
Parents: Yanas Tigan (mother); father (unnamed; living - in a scene cut from "Prodigal Daughter", Ezri told O'Brien that her father stayed away from her mother as much as possible)
Siblings: Janel, Norvo (brothers)
Love interest(s): Brinner Finok (on the Destiny); Julian Bashir (at end of series)
Dislikes: Raktajino, blood wine, gagh (they made her nauseous)
Having chosen not to undergo symbiosis training, Ezri was an assistant counselor on the USS Destiny, with three months to go in training, and the only Trill on board when the ship was taking the Dax symbiont to Trill. During the trip, the symbiont went into critical condition, and Ezri agreed to be joined in order to save its life. She afterwards took a leave of absence, and came to Earth to meet Benjamin Sisko in hopes that he could help her sort things out. She joined him on the journey to Tyree ("Image in the Sand"/"Shadows and Symbols"), and then returned to DS9.
There, Ezri reacquainted herself with Jadzia's old haunts, but had problems with the other officers not knowing quite how to treat her, and Worf in particular was cold towards her. She was asked by Sisko to treat Garak's claustrophobia, yet her self-doubt drove her to the brink of leaving Starfleet, until Worf finally softened his attitude toward her. Afterwards, Ezri accepted a posting as counselor on DS9 (with Starfleet Medical waiving the rest of her training) and was promoted to Lieutenant ("Afterimage").
Ezri reluctantly returned to her family's home in the Sappora system, so that her mother would use her influence to help find O'Brien. She eventually learned that her brother Norvo had killed Morica Bilby ("Prodigal Daughter"). Soon afterwards, she was assigned to use forensic psychology to solve a series of murders on the station, which she did after using the Rite of Emergence to gain insight from Dax's murderous host, Joran ("Field of Fire").
In "Penumbra", Ezri took a runabout without authorization to look for Worf after he was reported missing in action. She found him, and they ended up stranded on a planet, where they impulsively made love, and then were captured by the Breen. After an interrogation session by the Breen, however, Ezri murmured Julian's name ("'Til Death Do Us Part"). In the next episode, "Strange Bedfellows", while awaiting trial and execution on Cardassia, Worf and Ezri agreed that their indulgence had been a mistake, before they were then unexpectedly helped to escape by Damar. On returning to DS9, Ezri contemplated her feelings for Bashir ("The Changing Face of Evil"), and in "The Dogs of War", they finally got together romantically.
Ezri was on the Defiant in the last assault on the Dominion, after spending the night with Julian. She was one of the five regular characters remaining on the station at the end of the series ("What You Leave Behind").
Other facts: None of Ezri's family were joined. After joining, Ezri acquired a tendency to get spacesick. She was left-handed. Her nickname (used mainly by her brother Norvo) was Zee.