We do need another hero, gosh-darnit
While new Batman and Superman and Wonder Woman movies are all well and good, they are indeed iconic figures that can be revisited and viewed from a different angle and blah-de-blah, Hollywood has yet to do much more than scrape the surface of comic-book superhero possibilities.
I'm hoping that the rumors of a Namor: the Submariner movie are true. Now there's a conflicted character--half-man, half-fishguy, he vacillates between helping humans and beating them down for disrespecting his watery home. All this global warming fooforah must be making him awfully pissed.
The main trouble is that non-comic fans might laugh at the little wings on his ankles which somehow allow him to fly, not to mention the fact that he goes around in nothing but a swimsuit all of the time. But hey, they changed the X-Men's costumes, they can give him a new one, and maybe some gills and a few scales so he looks more amphibian. I'd drop the whole flying thing and concentrate on magical cgi underwater stuff. If I were a big Hollywood director, I'd steal the look of the anime Blue Submarine No. 6, just like the Wachowski brothers did with Ghost in the Shell.
A far as casting is concerned, I think Mark Dascascos has the cheekbones and the aristocratic hauteur fit for a Prince of Atlantis.