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The character Raj Koothrappali, played by Kunal Nayyar in "The Big Bang Theory," is an Indian-American astrophysicist. He is originally from New Delhi, India, and immigrated to the United States for his education and career. Raj's character is known for his thick Indian accent, love for Bollywood movies, and initial difficulty interacting with women due to selective mutism, which he eventually overcomes with the help of his friends.