Mister B. G. M. Carnehan is a fictional character from the novel "The Man Who Would Be King" by Rudyard Kipling. He is portrayed as a British adventurer who, along with his companion, seeks fortune and power in a remote part of Afghanistan. Carnehan's character embodies themes of ambition and the consequences of colonialism. In the story, Carnehan becomes a self-proclaimed king of a small tribe, showcasing his leadership skills and cunning. However, his journey ultimately leads to a tragic downfall, highlighting the complexities of imperialism and the impact of foreign influence on local cultures.