These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
More like colourism. Both Michiko and Atsuko are Afro-Latina, so Atsuko's nickname—"Jambo"— pokes at her (slightly) darker skin. Truth in television, especially with regard to race relations in Brazil. Still unfortunate.
Arguably the fact that voice actress Monica Rial is trying to duplicate urban black dialect.
The Woobie: Hatchin has some of this in the beginning. She gets better, though.