Leonardo DiCaprio has impersonated a lot of characters. For which role did he win an Oscar?

Explanation

Leonardo DiCaprio (born 1974) is an American actor. In the film 'What's Eating Gilbert Grape?' (1993) he plays the role as Gilbert's retarded younger brother, Arnie Grape. His performance was so convincing that it earned him his first Oscar nomination. DiCaprio has been nominated several times and won his Oscar in 2016. DiCaprio had his major break through in the film 'Titanic' (1997) and has since played in many major films.