A good actor, a good characterization and a character with a hook are almost guarantee of nomination and even prize, in addition to the applause of critics and the public. Here are some cases of actors and actresses very similar to the characters they played.
Cate Blanchett played Katherine Hepburn
Movie: The Aviator.
Philip Seymour Hoffman played the role of Truman Capote
Salma Hayek played Frida Kahlo
Anthony Hopkins was an excellent Alfred Hitchcock
Val Kilmer played the famous Jim Morrison
Movie: The Doors.
Anthony Hopkins became Richard Nixon
Michelle Williams replicated the mythical Marilyn Monroe
Movie: My week with Marilyn.
Marion Cotillard embodied Edith Piaf
Movie: Life in pink.
Bruno Ganz got into the skin of Adolf Hitler
Movie: The Sinking.
Sean Penn became gay activist Harvey Milk
Daniel Day-Lewis nailed Abraham Lincoln
Oscar Robert Downey Jr. got into the skin of Charles Chaplin
Helen Mirren got into the role of Queen Elizabeth II
Movie: The Queen.
Naomi Watts characterized as Princess Diana of Wales
Jamie Foxx was posing as blind musician Ray Charles
Meryl Streep playing Margaret Thatcher
Movie: The Iron Lady.
Ben Kingsley is practically traced like Gandhi