Make Aquaman into a biker-looking dude....
I can see pre-production in this movie and the main problem they faced...Aquaman is well, kind of not too manly, on the effeminate side of the super-hero spectrum. The solution? The lead will be a very large, extra-macho-man who would scare your average Hell's Angel.
Although his acting was fine, I think they went a little overboard with the choice. As the leader of a biker gang--very good!, as Aquaman well....