Aquaman supporting cast

I guess it’s pretty obvious that Aquaman will play an important part in the Justice League flick. Thus, besides the flashbacks about Atlantis, we’ll also be introduced to some Aquaman supporting characters. And I guess we can expect to see more of them in the 2018’s solo movie.

Thus, the most notable Atlantean seems to be Mera, who is Aquaman's partner in the comics. We don't know if this applies in the DCEU, as well. What we know is that Amber Heard portrays her and that her suit is green and seems to be like chainmail blending with her skin. And that sounds awesome.

The second Aquaman supporting character, Vulko, is played by Willem Dafoe. He is set to be the advisor of Arthur Curry and he is a veteran among the Atlanteans. His armor will be silvery and more elegant than that of the other Atlanteans.

Thus far, this is all that’s been revealed about the Aquaman supporting cast. And it doesn't seem like much. However, given the flashbacks, wouldn't that be too much of Atlantis in Justice League?