Early Life and Joining
Perciv was born on Trill in 2272, and applied to the Symbiosis Commission for a symbiont. As an initiate, he was specifically requested as a host by Drel, a symbiont who had never been joined before and believed he had "spunk." After joining, Perciv Drel left the Trill homeworld to attend Starfleet Academy in 2295, which other older joined Trill, including Quinn, considered very rash. This opened a schism between Drel and many of the older Trill that would last into the early 25th century. ("The Best Revenge")
Perciv became a part of starship design and spent most of his time working at Utopia Planitia Fleet Yards. There he was exposed to and adopted many customs from Earth. He had a particular fondness for the works of Sir Arthur Conan Doyle. He worked on a number of important design projects, including designs for the Galaxy, Intrepid, Nova, Defiant, and Sovereign class ships. During this time of relatively strong relations between the Klingon Empire and the Federation, Perciv learned to speak tlhIngan Hol.
During the Dominion War, in 2375, Perciv was part of a team working to reverse engineer the Klingon immunity to the Breen energy dampening weapon by studying various Klingon ship designs, but their efforts were ultimately unsuccessful. ("Survivors of Yamatai")
Perciv retired in 2391, after 96 years of service, at the rank of Captain, having never commanded a starship himself.
Personal Life and Death
In 2336, Perciv married a Trill data analyst, Ahlara. He had three children with her, two sons and a daughter, Leema. Both of Perciv's sons were posted on the USS Polaris when it was ambushed and destroyed by three Galor class warships during the Cardassian-Federation War in 2365. Leema later married and had two sons of her own. One was killed aboard the USS Majestic in 2374 when the ship was destroyed during Operation Return.
Despite his retirement, Perciv retained an active interest in Starfleet and the political affairs of the quadrant. He learned Romulan in order to keep his mind sharp. It was in part through this interest that he met Antori, a young lieutenant in Starfleet that he chose as the next host of the Drel symbiont. Perciv died on Jupiter Station in 2397 in the company of his daughter and grandson, at the age of 127.