Actor: Robin Williams (+ Dan Castellaneta in Return of Jafar)
Films: Aladdin (1992), Return of Jafar (1994), Aladdin and the King of Thieves (1996)
Genie has the appearance of an overgrown smurf, or a reject from James Cameron's Avatar. It is not known exactly what Genie looks like because he is able to change in a whisp of smoke, but it is assumed that his normal form is that of a blue jinn with a curly beard and ponytail (reminiscent of a blue Penn Jillette).
He is later freed by Aladdin and has to work as a relationship councillor to reconcile Aladdin and Jasmine after a falling out. Despite all of his magic, Genie never abuses his power by shape-shifting into anything inappropriate (although I'm assuming it must be very tempting), or to give Aladdin's irritating monkey the ability to use words to communicate rather than squeaking and pointing.
Robin Williams is, without a shadow of a doubt, one of the finest voice actors of our generation. Although he has become well known for his ability to deliver a huge vocal variety, including accents, Williams began his acting on the TV show Happy Days - and later spinoff Mork and Mindy. Around this time he also entertained audiences with his standup comedy - a trait that has continued throughout his career.
Williams' film career has been varied, but generally followed comedy with roles in Good Morning Vietnam (1987) as a radio host and Mrs Doubtfire (1993) where he plays a man who dresses up as a Nanny to get access to his kids.
Despite this, Williams has never shied away from more edgy material with thrillers Insomia (2002) and One Hour Photo (2002) being good examples of his more serious side. Williams won an Oscar for his role as a therapist in Good Will Hunting (1997).