TK-9H4 served as a stormtrooper within the ranks of the Galactic Empire, and it is believed he was a member of Grand Admiral Nial Declann's close protection detail.
TK-9H4's assignment placed him at the Theed Royal Palace in 1 ABY, where he served alongside Declann and a fellow stormtrooper identified as TK-8H2.
Within the MMORPG Star Wars Galaxies, TK-9H4 appears as a Non-Player Character (NPC). His role in the game is limited to guarding Nial Declann.