Lera Kesta

Ensign Lera Kesta was a Joined Trill Starfleet officer that served on board the NX-04 Discovery for four years between 2161 and 2165. (Star Trek: Discovery)

Early Life
Born Lera Silja, Lera was born shortly after Trill made first contact with Earth. Her parents where noted diplomats, and she spent a few years on Earth before returning to Trill where she entered the Initiate Program. She would also, despite objections from members of the Trill government, apply to Starfleet Academy, and thanks to the sponsorship of Captain Erica Hernandez, she became the first Trill Starfleet cadet.

Shortly before she went to the Academy however, she was selected to be joined and when the previous host of the Kesta symbiont died, she was joined to the symbiont. It was never entirely explained to Starfleet why her name was changed.

Starfleet
Lera graduated from the academy just as the Earth-Romulan War was drawing to a close, having excelled in communications, she was selected by Jonathan Archer to be the communications officer on the NX-04 Discovery, the last NX-class vessel in service after the other ships where destroyed in the war or retired. She was present during the majority of the missions done by the Discovery.

At some point she told Captain Todd that she was Joined, up until then only the ship's doctor had been privy to that knowledge. This would start to create some dissent between the Kesta symbiont and the Symbiosis Comission, and nearly cost the Symbiont its life.

After the Discovery was retired, Lera went on to serve on at least 3 more ships, and retired from active duty at the rank of Lt. Commander.

After Starfleet
After Lera retired, she served as the Trill ambassador to the Federation, and helped broker a trade deal with the Klingon Empire. She would die in 2249, having set the stage for future Trill Starfleet Officers.

Personality
Lera was usually viewed by histories as being rather quirky, despite having to hide the secret of being Joined from her Captain, she was regarded as being friendly and open by her crewmates. She would continue this into her diplomatic career, and usually surprised the other diplomats by trying to be more friendly with them than necessary.

Starfleet Career

 * NX-04 Discovery
 * USS Alexander (NCC-03)
 * USS Cibola (NCC-12)
 * USS Constance (NCC-18)