I first encountered the term "Incidental Diversity" in the HornBook article "2015 in Review: The Year in Pictures" by Julie Danielson. Incidental Diversity is "the appearance of characters of color whose ethnicities are incidental to the story."
Now I'm actively on the lookout for such books. Here are 9 books that Julie featured in her article, plus 1 more too good not to share:
(truth in advertising!)
is required to be less verbose.
what is expected from a robot.