At first glance a black man in a worn suit, Jules welcomes people to the big city with his silver tongue and gold plated teeth. He operates near its entrance and will offer to tell any newcomers all about the city, including arranging a discount for those shopping at New Reno Arms. Jules will rent his tongue for pretty much anyone, long as he's paid to advertise for them. He also sells drugs, of course.
His flashy style and silver tongue are a cover for his darker side, as he will do anything to keep himself afloat, including tipping off T-Ray's crew about the Highwayman parked downtown and even murdering a child, when he rats the bastard out.
Recover your stolen car: When the car is stolen, he can be interrogated for clues. If Cody told the Chosen One about Jules' involvement, the Chosen One needs to remind the dealer that should anything happen to the kid, the Chosen One will "kill [him] so many times [he]'ll need multiple wills".
Jules will tell the Chosen One freely about the city, but asking about the families costs the Chosen One. Once paid, this opens up several conversation options that provides hints to many, many quests in the city.