Frost

Frost was a Stormtrooper and later a Imperial Sovereign Protector in service of the Galactic Empire under Palpatine, later Natasi Daala, and finally Emperor Fel of the Fel Empire. He was a highly skilled fighter, being in one of the most elite Imperial military units, and was also skilled with the Dark Side of the Force. He served since 3 BBY. He was present on both Death Stars while they were under construction for protection, and ended up getting transfered back to Coruscant or a different post before the stations' destruction.