Counselor Troi

Deanna Troi
Star Trek character
Commander Deanna Troi
First appearance	"Encounter at Farpoint" (TNG)
Portrayed by	Marina Sirtis
Information
Family	Ian Andrew Troi (deceased) (father) Lwaxana Troi (mother)
Children	Ian Andrew Troi, II (deceased)
Species	Betazoid (maternal) Human (paternal)
Affiliation	United Federation of Planets Starfleet
Posting	USS Titan (NEM) USS Enterprise-E (FCT, INS, NEM) USS Enterprise-D (Seasons 1-7, GEN)
Position	Diplomatic Officer (USS Titan) Counselor (USS Enterprise-E, USS Enterprise-D)
Rank	Commander (Season 7, Movies) Lieutenant Commander (Seasons 1-7)
Partner	William Riker

Ian Andrew Troi (deceased) (father)

Commander Deanna Troi /diːˈænə/ is a main character in the science-fiction television series Star Trek: The Next Generation and related TV series and films, portrayed by actress Marina Sirtis. Troi is half-human, half-Betazoid and has the psionic ability to sense emotions. She serves as the ship's counselor on USS Enterprise-D. Throughout most of the series, she holds the rank of lieutenant commander. In the seventh season, however, Troi takes the bridge officer's examination and is promoted to the rank of commander, but continues as counselor. As of Star Trek: Nemesis she is credited as "Deanna Troi-Riker" because of her marriage to William Riker.

Deanna Troi was born on March 29, 2336, near Lake El-Nar, Betazed. Deanna's parents are Betazoid Ambassador Lwaxana Troi (portrayed by Majel Barrett), and deceased human Starfleet officer Lt. Ian Andrew Troi (portrayed by Amick Byram). An older sister, Kestra, was accidentally drowned during Deanna's infancy (see "Dark Page"). Although Deanna Troi has little exposure to Earth culture, she attended Starfleet Academy from 2355 to 2359, as well as the University on Betazed, and earned an advanced degree in psychology.