Since the cast of Willem Dafoe in the Justice League movie, his role was a mystery, but today was reveal that he will play Vulko.
“Created by Bob Haney and Howard Purcell, Vulko is an Atlantean politician and a mentor to Aquaman. He offers level and sound advice in time of crisis and lives as the city’s oldest dignitary. Prior to Aquaman’s rule, Nuidis Vulko was around for his birth. He argued against the curse of Kordax and refused to abandon Aquaman, however, this may not be an issue for Momoa’s portrayal as Arthur Curry’s hair won’t be blonde.”
How big the role of Willem Dafoe’s Vulko is unknown, but we know that he will apear with a full Atlantean costume and he probably will be in the Aquaman solo movie in 2018.
Also we have the news about Kristofer Hivju joining the cast of the Justice League movie, Hivju is known for his role in the Game of Thrones series, he plays Tormund Giantsbane, the red head wilding who works with Jon Snow. Hivju will be playing an ancient Atlantean king, he appeared in concept art on the wall of the production office.
Remember the Justice League is coming out November 17, 2017.
Source: comicbook.com, ign.com