Warren William? Smarmy, yet effective.
Yet an interesting person, if one is to believe imdb.com: "Personally, Warren William was a shy and retiring type. Speaking of him, five-time Warners co-star Joan Blondell said that William "was an old man even when he was a young man." According to San Francisco critic Mick LaSalle's 2002 book "Dangerous Men: Pre-Code Hollywood and the Birth of the Modern Man" (New York: St. Martin's Press, 2002), William, who quite unlike his early Warner Bros.' stereotype as a heartless "love 'em and leave 'em"-style seducer, remained married to one woman throughout his adult life. He was an active inventor with multiple patents, designing one of the first recreational vehicles, reportedly so he could continue to sleep while being driven to the studio in the morning."