Animal House. The older I get, the more sympathy I have for Dean Wormer.
The Godfather and other gangster movies - the political idea of just doing what you need to do to look after your people.
The Joker - it’s become a meme. Look up “Jokerfied”
The Watchmen - Alan Moore had to tell smelly antisocial fans that his characters weren’t meant to be idols.
Lolita - Libertarians have seen the protagonist as a hero.