Lexei was a general within the ranks of the Rebel Alliance. To secure a favor from Lexei regarding his next assignment, Nath Tensent, a pilot, commanded his squadron in the Battle at Trenchenovu against the Galactic Empire's Trenchenovu shipyards. This battle occurred six months before the Battle of Endor in 4 ABY. During the assault, Tensent's squadron was overcome, and Tensent, as the sole remaining member, later shared the narrative of the mission with Lieutenant Yrica Quell a few weeks following the Battle of Endor, in which he made reference to Lexei.
Alexander Freed referenced Lexei in his 2019 novel, Alphabet Squadron.