A number huh...like two
The only black people I can think of was Morgan Freeman and Debo.
Now that I think of it I don't think there have never been any black actresses in any superhero movies expect for Halle and Zoe's (and they're bi-racial, but I'm sure they were counted as black ) limited parts in the X-Men movies.
This is why I'm glad I don't support these movies at the box office. At least they throw black actors a bone here and there, black actresses don't even exist in the mind of Hollywood, unless they are looking for someone to play Mammy.
That black guy that offers money to kill the Joker.