With regards to the Duanes, I'd argue that a main character is POC, in that Kit-and-Nita are both the leads; Kit is not a secondary character. I don't recall off the top of my head how the pov was distributed in the first two, but certainly in later novels it's split pretty much evenly between them (although that is complicated by later plot developments). That said, Kit's ethnicity is rarely touched on, and it's easy to not notice that he's Latino.
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With regards to the Duanes, I'd argue that a main character is POC, in that Kit-and-Nita are both the leads; Kit is not a secondary character. I don't recall off the top of my head how the pov was distributed in the first two, but certainly in later novels it's split pretty much evenly between them (although that is complicated by later plot developments). That said, Kit's ethnicity is rarely touched on, and it's easy to not notice that he's Latino.