Robin Williams was a comic genius, but it wasn't his only forte. If we look at some of his best roles, his character mentored other characters, most popularly in Dead Poets Society (1989) and Good Will Hunting (1997). The former had Ethan Hawke in it, who recently discussed some bits during the shooting days.
In an interview with Vanity Fair, he explained that the actor didn't do the script, and that made all the difference for him. He said,
"Robin is a comic genius. But dramatic acting was still new to Robin at that time,” Hawke said. “And watching that relationship like, in the room — I was four feet away while they’re talking about performance — and that was something you don’t un-see. Robin Williams didn’t do the script, and I didn’t know you could do that. If he had an idea, he just did it. He didn’t ask permission. And that was a new door that was opened to my brain, that you could play like that."
It was this movie that gave Hawke the much-deserved attention in Hollywood. Most recently, he appeared as the sinister spirit of the Grabber in Black Phone 2, which tells the story of a few kids trying to get rid of this vengeful force.
Some of the best roles Robin Williams has played throughout his career

Robin Williams had a range, and the aforementioned films, Dead Poets Society and Good Will Hunting, are two of his best films to date.
In Dead Poets Society, he plays an English teacher, John Keating, who changes the way students study English at Welton Academy. However, his methods aren't really liked by the school management, and we get to see the true face of what we call teachers in it.
His role in Good Will Hunting was of a teacher only, but the character was the total opposite if we speak of attitude. He played Sean Maguire in it, and he wasn't as gentle as Mr. Keating of Welton Academy. This character grabbed his student by the neck, but then this character demanded that kind of attitude.
Another of Robin Williams's iconic roles is that of the Genie from Disney's Aladdin (1992), an animated film where he lent his voice. It wasn't just one of his best performances but also a revolutionary one for the industry, as it marked the beginning of using celebrity voices for animated characters.
One of his roles that shows his range came after Aladdin, in Mrs. Doubtfire (1993), where he played a he (Daniel Hillard) and a she (Mrs. Euphegenia Doubtfire). The latter was a disguise, because he needs work if he wants to share the custody of his children following his divorce.
He also appeared opposite Al Pacino in Insomnia (2002), where he played the main antagonist, Walter Finch. It was the third feature by Christopher Nolan.
His final movie came out in 2014, which was The Angriest Man in Brooklyn (2014). The rest of the movies featuring Robin Williams were then released posthumously, which included Night at the Museum: Secret of the Tomb (2014), Chew (2014), Absolutely Anything (2015), and more.
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