Deanna Troi is a Betazoid-Human hybrid Starfleet officer in the Star Trek universe, best known as the ship's counselor aboard the USS Enterprise-D under Captain Jean-Luc Picard. As a half-Betazoid, she possesses empathic and limited telepathic abilities that repeatedly prove valuable to her crewmates when assessing the intentions of other species.
Born on Betazed in 2336 to the Betazoid ambassador Lwaxana Troi and the Human Starfleet officer Ian Andrew Troi, Deanna studied psychology at the University of Betazed and graduated from Starfleet Academy in 2359. She joined the Enterprise-D as counselor in 2364 and later transferred with the crew to the USS Enterprise-E.
Troi's long relationship with William T. Riker culminates in their marriage, and by the late 24th century the couple live on the planet Nepenthe with their daughter Kestra Troi-Riker. The character appears across Star Trek: The Next Generation, its feature films, and Star Trek: Picard. This overview summarizes source material under CC BY-SA; detailed chronology is presented in the Timeline.
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