Best Characters Played by Robert Deniro

The Top Ten
1 Travis Bickle (Taxi Driver) Travis Bickle, a 26-year-old honorably discharged U.S. Marine, is a lonely, depressed young man living on his own in New York City. He becomes a taxi driver to cope with his chronic insomnia, driving passengers every night around the city's boroughs. He also spends time in porn theaters and keeps a ...read more.
2 Vito Corleone (The Godfather: Part II) Vito Andolini Corleone is a fictional character in Mario Puzo's novel The Godfather and in Francis Ford Coppola's film series based on the novel, where he was portrayed by Marlon Brando in The Godfather and, as a young man, by Robert De Niro in The Godfather Part II.

The guy learned Italian for this role and it was his breakout role!

3 James Conway (Goodfellas)
4 Sam 'Ace' Rothstein (Casino)
5 Jack Byrnes (Meet the Parents)
6 Murray Franklin (Joker)
7 Fearless Leader (Rocky and Bullwinkle)
8 Neil McCauley (Heat)
9 Don Griffin (The Big Wedding)
10 Giovanni Manzoni (The Family)
The Contenders
11 Sam (Ronin)
12 Jake LaMotta (Raging Bull)
13 Rupert Pupkin (The King of Comedy)
14 Harry Tuttle (Brazil)
15 Master Chief Billy Sunday (Men of Honor)
16 Pat Sr. (Silver Linings Playbook)
17 Louis Gara (Jackie Brown)
18 Max Cady (Cape Fear) Max Cady is a fictional character and the primary antagonist of the John D. MacDonald novel The Executioners. He was portrayed by Robert Mitchum in Cape Fear and Robert De Niro in Martin Scorsese's Cape Fear.

Excellently played. He's easily one of my favourite actors.
Great list MatrixGuy!

19 Al Capone (The Untouchables) Alphonse Gabriel "Al" Capone, sometimes known by the nickname "Scarface", was an American gangster and businessman who attained notoriety during the Prohibition era as the co-founder and boss of the Chicago Outfit.
20 Analyze That (Paul Vitti)
21 Lorenzo Anello (A Bronx Tale)
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