Commander Lex Nakashima was a Starfleet officer in the 24th century. His serial number was FSN 695-08-0827.
In 2364, he was serving aboard the USS Robert Louis Stevenson. On or about stardate 41044.2, according to an order sent by Commodore Bill Marafe of Starbase 55, he was scheduled for a transfer to the USS Discovery. (TNG: "Conspiracy", okudagram)
This character was only mentioned in writing.