Originally Posted by juggle
This guy is playing Constantine
Hair dyes exist.
It has more to do with Momoa being a bit darker in skin tone. Good example would be Jessica Alba in Fantastic Four; dye or wig, with her skin tone (which is similar to Momoa's) the blonde color just didn't look good at all. I get why they went with Momoa though. Feel like they're trying to establish a more accurate Mediterranean/Greek look.