DC and Marvel comics are highly diverse.They are more diverse then dc and marvel movies on average.The dc and marvel shows are more diverse then dc and marvel movies too on average.
The new black female ironman is really called iron-heart by the way.Tony stark is still around.There are alot of black,asian and latino superheroes in dc and marvel comics and other comics in the u.s.
There are alot of brown and some native american superheroes too in comics.So a lot of poc superheroes are in comics in the u.s. and worldwide like asia, latin america,africa,europe etc..
It's growing.
Don't forget milestone comics that have mostly poc is apart of dc even if it's not in the main dc universe.
There comicbook companies in u.s. with alot of poc,like image,lionforge( this a new one)idw,valiant comics etc...
There are other superhero comics/companies that are from the americas, latin america,africa,native american,arab,asian,europe etc..etc.. as well