S'Dar (TNG)

Lieutenant Commander S'Dar is a male Romulan who lives in the 24th century and services the Federation, Starfleet and services on board the USS Enterprise (NCC-1701-E) under the command of Captain Elizabeth Lochely. (Star Trek: The Next Generation)

Early life
S'Dar was born in the late 2360s on his homeworld of Romulus and was taught to hate humans and the Federation that their ideals are poison to the galaxy, S'Dar was raised by his parents even though they weren't around much due to being out there along the Neutral Zone border between Federation and Romulan space.

He lost his parents during the Borg Incursion of 2366-2367 when a combined Federation/Klingon/Romulan force was assembled at Wolf 359, but the battle was one sided and his parents lost their lives but he knew they wouldn't go down without a fight and he remained stead fast in his studies and hated the Federation.

Then in 2378 The Federation and the Romulan Star Empire made peace after decades of mistrust and conflicts the two powers finally made peace, and there were opening for Starfleet Academy and S'Dar applied and he was accepted by the Academy.