JM-909 identified a stormtrooper within the Imperial forces; this individual was a male human. Serving as the leader of his squad, he found himself stationed on the planet Tatooine circa 0 BBY. A group of Tusken Raiders laid an ambush for him and his squad, making off with their provisions and armaments. He was the only survivor of that assault, subsequently located and healed by the reclusive Jedi Master known as Obi-Wan Kenobi. After awakening, JM-909 momentarily absconded with Kenobi's lightsaber, only to relinquish it before fleeing from Kenobi's home. Upon his return to Imperial custody, his commander severely reprimanded him as he only spoke the name "Ben," which was the alias Kenobi utilized.
The character JM-909 made his debut in Star Wars: Obi-Wan, specifically the fifth installment, Obi-Wan 5. Christopher Cantwell penned the story, and Marvel Comics released it to the public on September 14, 2022.