Guri was a Human replica droid, designed to be an almost perfect replica of a Human female, and the only one of her kind engineered as an assassin. She was created around 7 BBY by the Imperial researchers Simonelle and Massad Thrumble for Prince Xizor, head of the Black Sun crime syndicate.
After being sold to Xizor for nine million credits, Guri served as his lieutenant and was one of the few individuals the necessarily paranoid crime lord believed he could trust. Xizor left Guri to attend to much of the day to day running of Black Sun and many incorrectly assumed that she was the leader of the syndicate.
Guri also served as an assassin, eliminating several of Xizor's enemies, including Imperial Advisor Fendrilon Koozar, the Ubese bounty hunter Boushh and the leaders of the rival company Ororo Transportation.