Great Movies w/ Singular Character in Solitary Despair?

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Maybe a better question would be, "Is there a movie like 'Hunger'"? He's in every scene. The people he meets along the way aren't important, and take up no more than a few seconds. He's a writer who can't eat because he can't write. He can't write because he doesn't eat. The little money he makes, he gives away. He's in a battle with himself. I think because the character from Knut Hamsun's "Sult" is so rare also helps this 10/10.. Per Oscarsson is also one hell of an actor who could be so convincing in Danish or English (Peckinpah's "Wine Noon")