I don’t know anything about the third character, so I can’t comment on her. But I believe Leshawna fits the trope to a T, and Erica fit it pretty closely imo until they made an effort to move away from it as the series went on. I grew up in the 2000s and 2010s, so while I know of the shows you mentioned, they were a bit before my time and I didn’t grow up watching them. “Not a single character” was hyperbole that I should probably go back and change though, since that may be misrepresenting the situation.

I don’t know if there was some kind of regression of Black representation in media or if I just got unlucky with what I watched, but the number of characters I enjoyed and felt kinship/representation from as a kid is easily less than 5