Hellenic (Greek) characters in movies

Beneath The 12-Mile Reef (1953)
Ύφαλος 12 Μιλίων
(imdb, wiki)

Tony Petrakis (Robert Wagner)

Executive Decision (1996)
Κρίσιμη Απόφαση
(imdb, wiki)

Senator Mavros (J.T. Walsh)

15 Minutes (2001)

15 Λεπτά

(imdb, wiki)

Nicolette Karas (Melina Kanakaredes)

Frankie & Johnny (1991)
(imdb, wiki)

Nick (Hector Elizondo)

Tino (Greg Lewis)

Godzilla (1998)
Γκοτζίλα
(imdb, wiki)

Dr. Niko Tatopoulos (Matthew Broderick)

Sleepers (1996)
(imdb, wiki)

Hot Dog Ventor (George Georgiadis)

The Greek Tycoon (1978)

Ο Έλληνας Μεγιστάνας

(imdb, wiki)

Theo Tomasis (Anthony Quinn)

The Thin Red Line (1998)
Η Λεπτή Κόκκινη Γραμμή
(imdb, wiki)

Captain James ''Bugger'' Staros (Elias Koteas)

Weird Science (1985)
Ηλεκτρονικό Μανούλι
(imdb, wiki)

Dino (John Kapelos)

To be added:

Col. Andreas Stavrou (Anthony Quinn): The Guns Of Navarone
Alexis Zorba (Anthony Quinn): Alexis Zorbas
Constantin Demeris (Raf Vallone): The Other Side Of Midnight
Nikolas Natchios (Erick Avari): Daredevil
Gus Portokalos (Michael Constantine): My Big Fat Greek Wedding
Father Karras (Jason Miller): The Exorcist
Lieutenant Kassimatis (Nick Damici): World Trade Center
Kristatos (Julian Glover): For Your Eyes Only
Nick (John Malkovich): Eleni
Nick The Greek (Stephen Marcus): Lock, Stock and Two Smoking Barrels
Bambas (Alki David): The Bank Job
Phaedra (Sophia Loren): Boy On A Dolphin
Zeno (Telly Savalas): Escape To Athena

Also:
Hellenic charaacters in TV series

Jesse Katsopolis (John Stamos): Full House
Victor Kyriakis (John Aniston): Days Of Our Lives
Theo Kojak (Telly Savalas): Kojak
George Papadopolis (Alex Karras): Webster