Klef was a Gran male who lived with his family in the Gnawer's Roost district of Coruscant and who worked as a bartender in the Invisible Hand cantina. When the cantina became the site of a shootout between the ISB agent Tavik Moern and some Quarrens against the Alderaanian Resistance, Klef ducked behind the bar and remained there until it was safe.

He could speak Basic, Gran, Huttese, Quarrenese and Skakoverbal.