Raoul is an anime-only character. He owns a bar at Loguetown called Gold Roger. In his youth, he used to know Gol D. Roger, who visited his bar and told him he would conquer the Grand Line.

Gol D. Roger and his crew once visited Raoul's bar before venturing to the Grand Line. Raoul tried to warn Roger about the dangers of the Grand Line, but Roger was more excited than deterred.

When Smoker was in charge of the Marines stationed in Loguetown, no pirates visited Raoul's bar and Smoker became his only customer. When Luffy came to the bar by coincidence, Raoul told him about Roger's exploits. He was deeply shocked at hearing Luffy saying he will be the next Pirate King and noted that the young boy was similar to Roger in his presence.

After Luffy left, Smoker visited the bar for a drink. Raoul was not pleased with Smoker's presence.

(Source: One Piece Wikia)