Although he is based on Harriet Jacobs’s real-life master and while there is is no reason to think that she exaggerated his vicious nature, Dr. Flint often seems more like a melodramatic villain than a real man. He is morally bankrupt and lacks any redeeming qualities. He is thoroughly one-dimensional, totally corrupted by the power that the slave system grants him. He sees no reason not to use and abuse his slaves in any way he chooses, and he never shows any signs of sympathy for them or remorse for his crimes. If Dr. Flint expresses kindness, it is invariably a ruse to try to get Linda to sleep with him. Dr. Flint represents the cruelty, callousness, and treachery of the entire slave system.

Dr. Flint loves power above all else, and it often seems that forcing Linda to submit to him is more important to him than simply sleeping with her. He is galled and infuriated by her defiance, and he becomes obsessed with the idea of breaking her will. Rather than simply raping her, he persists in his efforts make her acknowledge his mastery. When Linda escapes, he pursues her relentlessly, putting himself hundreds of dollars in debt to chase her to New York. After his death, his venom and determination seem to be reincarnated in the form of his son-in-law, Mr. Dodge. Dr. Flint neither changes nor grows over the course of the narrative. His malice, representing all of the evils of slavery, appears to affect Linda even from beyond the grave.