Vito and Joker, meet Anita. With Ariana DeBose’s Best Supporting Actress Oscar win Sunday night for “West Side Story,” Anita became the third character to produce Oscar wins for two different performers.

The first was Vito Corleone, for which Marlon Brando won Best Actor for “The Godfather” (1972). Two years later, Robert De Niro won Best Supporting Actor for the same role in the sequel/prequel “The Godfather Part II” (1974). Forty-five years later, Joaquin Phoenix took home Best Actor for his turn in title role in 2019’s “Joker,” 11 years after Heath Ledger posthumously won Best Supporting Actor for the iconic Batman villain in 2008’s The Dark Knight.”

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The character of Anita, of course, won Best Supporting Actress for Rita Moreno in the 1961 version of “West Side Story.” Besides being the first female character in this group, Anita is the first of the three whose...