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Part of the reason why Zack Snyder cast Jason Momoa as Aquaman is because he wanted to make him cool. Aquaman is a character that’s typically mocked in pop culture, and with the Aquaman movie they’re additional taking steps to change that.
Take for example concept art of a sea dragon from the movie, above. According to Entertainment Weekly, the sea dragons are ridden by the people of Xebel — one of the seven underwater kingdoms of Atlantis, their leader is King Nereus (Dolph Lundgren) and Mera (Amber Heard) is one of their warriors.
From Batman News: