|Affiliation:||United Federation of Planets|
|Parents:||Father: Hiro Ishikawa|
|Children:||Molly O'Brien, Kirayoshi O'Brien|
|Assignment:||Director of the I.A.A.C. Andak project on Cardassia|
Keiko O'Brien was a female Human in the 24th century, a civilian botanist and the wife of Starfleet engineer Miles O'Brien. The two met and married on the USS Enterprise-D and later lived together on Deep Space 9, Earth and Cardassia.
In the 2360s Keiko was assigned to the USS Enterprise-D as a botanist in the ship's arboretum (TNG episode: "Data's Day"). On the Enterprise, prior to 2364, Keiko met Miles when the two accidentally collided. Keiko was carrying b'lednaya flowers at the time, which got broken in the collision (TNG novelization: All Good Things...)
In 2369, Keiko was involved in a shuttlecraft and transporter accident that resulted in her body being returned to that of her childhood self. A cure was eventually found to restore her to her adult form. (TNG episode: "Rascals")
Deep Space NineEdit
Later in 2369, Miles transferred to Starbase Deep Space 9 and Keiko and the family went with him. With little use for a botanist, Keiko opened a school on the station. Later that year the school became the subject of a dispute over how the children, Federation and Bajoran, were being taught; some Bajorans taking offense at the Bajoran wormhole being explained as a scientific anomaly rather than for its theological value to the Bajoran people. This dispute eventually resulted in the school being bombed, fortunately when no one was in attendance. (DS9 episodes: "Emissary", "A Man Alone", "In the Hands of the Prophets")
The next year Keiko was still wary of upsetting the Bajoran faith and was careful to make sure her students were mindful and respectful of each other's diverse beliefs. As she was trying to explain the Vulcan idiom of the IDIC to a Tellarite student a lost baby Horta burrowed into the class, inciting panic. Whilst the students fled Molly starting feeding the Horta a computer which seemed to keep it satisfied for a time, Keiko followed her daughter's example to keep the Horta happy. (DS9 novel: Devil in the Sky)
The following year Keiko became pregnant with her and Miles's second child. However, after she was injured in a shuttle accident, the fetus had to be transplanted into the womb of Kira Nerys in order to save Keiko's and the child's life. The baby, Kirayoshi, was born the following year on DS9. (DS9 episodes: "Accession", "Body Parts", "The Begotten")
For a period of time in the Dominion War, Keiko and her children returned to the relative safety of Earth. They had returned to residence on the station by the end of 2374. (DS9 episodes: "Call to Arms", "Change of Heart", "Time's Orphan")
Earth and CardassiaEdit
In late 2376, Keiko received an offer from the Interstellar Agricultural Aid Commission to be the project leader of agricultural planetary renewal for post-war Cardassia. She turned down the position at first, but changed her mind after talking it over with Miles. (DS9 novel: Unity)
In early December, shortly after the O'Briens relocated to Cardassia, Keiko was amongst a group of hostages taken by representatives of the Cardassian group calling themselves the True Way, who were attempting to destabilize the fledgling government of Alon Ghemor. The situation was brought to a peaceful conclusion and Keiko continued her work on Cardassia. (DS9 novel: Cardassia: The Lotus Flower)
In 2378, while on Cardassia Miles was approached by the now-adult Rugal Pa'Dar - a Cardassian boy the O'Briens had hosted in 2369. Pa'Dar, who wished to become a Federation citizen and formally adopt the human ophan Hulya Kiliç, would ask Miles and Keiko how to go about this. It was decided he should travel to Earth and formally apply there. Keiko would accompany Rugal and Hulya, accompany them to the Cardassian Embassy on Earth and speak at Rugal's citizenship trial. (DS9 novel: The Never-Ending Sacrifice)
In an alternate timeline, Keiko and Miles married and had Molly before the Borg Incursion of 2366-2367. During the invasion, the Enterprise's saucer section was destroyed. Molly and Keiko were among those killed. (TNG comic: "The Worst of Both Worlds", TNG comic: "And Death Shall Have No Dominion")
- TNG short story: "Beginnings"
- TNG episode: "Data's Day"
- TNG episode: "The Wounded"
- TNG episode: "Night Terrors"
- TNG novel: Imbalance
- TNG episode: "In Theory"
- TNG episode: "Disaster"
- TNG episode: "Violations"
- TNG episode: "Power Play"
- TNG novel: The Romulan Prize
- TNG novel: Here There Be Dragons
- TNG episode: "Rascals"
- DS9 novelization: Emissary
- DS9 episode: "A Man Alone"
- DS9 novel: The Siege
- DS9 novel: The Star Ghost
- DS9 episode: "If Wishes Were Horses"
- DS9 episode: "In the Hands of the Prophets"
- DS9 novel: Warchild
- DS9 episode: "The Siege"
- DS9 novel: The Big Game
- DS9 novel: Prisoners of Peace
- DS9 novel: Fallen Heroes
- DS9 episode: "Cardassians"
- DS9 novel: The Pet
- DS9 novel: Devil in the Sky
- DS9 episode: "Rivals"
- DS9 novel: Arcade
- DS9 novel: Field Trip
- DS9 episode: "Whispers"
- DS9 novel: Antimatter
- DS9 episode: "Tribunal"
- DS9 novelization: The Search
- DS9 episode: "The House of Quark"
- DS9 novel: Proud Helios
- DS9 episode: "Fascination"
- DS9 comic: "Fadeout"
- DS9 novel: The Tempest
- DS9 novel: Wrath of the Prophets
- DS9 episode: "Accession"
- DS9 episode: "Hard Time"
- DS9 episode: "Body Parts"
- DS9 short story: "Life's Lessons"
- DS9 episode: "Looking for par'Mach in All the Wrong Places"
- DS9 episode: "The Assignment"
- DS9 episode: "The Begotten"
- SCE eBook: Aftermath
- DS9 - Mission Gamma novel: Lesser Evil
- DS9 novel: Unity
- DS9 - Worlds of Star Trek: Deep Space Nine novel: Cardassia: The Lotus Flower
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