The role of the Genie in the 1992 animated movie Aladdin was specifically created for Robin Williams because Disney wanted him to voice the character so much. What is more unusual about this character is that many of his lines were improvised. For some scenes he was given topics or dialogue suggestions but many dialogues were ad-libbed. So the Genie has a lot of Robin William’s personality and humour. Later the producers would just cherry pick the parts they liked the most to form the Genie’s character.