Deanna Troi has a Betazed mother (Lwaxana, daughter of the fifth house, holder of the sacred chalice of Riix) and a human father, Ian Andrew (according to "The Child" and "Star Trek Chronology - The History of the Future"), a deceased Starfleet officer. She has a deceased older sister, Kestra ("Dark Page").

She was born on March 29, 2336 on Betazed, and was at SFA form 2355-2359 ("Conundrum"). According to "Star Trek Chronology - The History of the Future", Deanna Troi was on the planet Betazed studying psychology at the University of Betazed. This is in the year 2357. She joined the Enterprise in the 2364. So we have to make up information between the years. Perhaps the U of B is affiliated with SFA.

She enjoys chocolate, and was romantically involved with Riker. They broke up in the year 2361 ("Second Chances"). In year 2370, Troi and Worf seem to have a romantic relationship, but it is believed that this relationship was terminated somehow since Worf and Dax are involved on DS9 station currently. She used to have a betazoid cat ("Pen Pals"). She had one child, Ian ("The Child"), who turned out to be an alien that wanted to know about human.

Her character was based on Ilia. She is an empath.

She took the Starfleet commander exam and obtained her commander rank on stardate 47611 (in year 2370) ("Thine Own Self"). She was at the helm when Enterprise-D crash-landed on Veridian III planet on stardate 48450 (in year 2371) ("Star Trek: Generations").

She resided in deck 8, room 0910 on Enterprise-D. Her current assignment is on Enterprise-E. She found and drank with Zefram Cochrane when Enterprise-E went back to the past (April 3, 2063) ("Star Trek: First Contact").