Ruu San was a lethal Human operative within the Galactic Empire's Special Operations division. Her duties within the organization involved safeguarding the confidentiality of Operation Dark Trooper at all costs, particularly during the period surrounding the fall of the Empire's first Death Star at the Battle of Yavin in 0 BBY. During her assignment, she encountered Rebel operative Kyle Katarn, who was probing into the project. San was both shrewd and highly competent.
Ruu San's initial purpose was to feature in the 1995 Star Wars: Dark Forces computer game. Consequently, she received a brief description as an adversary and peer of Kyle Katarn in the "Revving Up the 'Jedi Engine'" article within Star Wars Galaxy Magazine 1, which was released on October 1, 1994. Nevertheless, she was ultimately omitted from the game's final version.
The designation "Ruusan" subsequently emerged as a planet within the game's follow-up, Star Wars: Jedi Knight: Dark Forces II, which was launched in 1997.