El Jefe is a tiger from Siberia who appears as the first villain boss in Sly Cooper: Thieves in Time. The Cooper Gang track down El Jefe in Feudal, Japan in the first episode of Sly 4: "Turning Japanese".
Being a mercenary commander, El Jefe was very powerful, dominating many small countries around the world and selling them to the highest bidder. Eventually, Interpol figured out what El Jefe was doing and started to pursue him. Before they could reach him, El Jefe dissapeared. Interpol never could figure out his new location. After some time, El Jefe was contaced by Le Paradox and was hired to erase Rioichi Cooper from history. El Jefe is highly suspected to be the one that poisoned the feudal era's Shogun's sushi as part of a ploy that would frame Rioichi and have him thrown in jail.
During the Cooper Gang's pursuit of El Jefe, they were able to find out plenty of information from him as Bentley used his RC car with a microphone attached to follow El Jefe around to eavesdrop. Part of El Jefe's plan was to steal Rioichi's cane, which he successfully did, prompting Sly to go after him and eventually fight him one-on-one. Although Sly defeated El Jefe, before he could retrieve Rioichi's cane, Le Paradox's troops swooped in and gassed the area, stealing the cane themselves and taking it to Le Paradox's blimp. El Jefe was then arrested and sent to a prison in South America. While in prison, El Jefe was given then job of rolling cigars, but was not allowed to smoke them himself.