The question itself assumes that a character who is Latino/a will have skin coloring that means they won't visibly look white, or, that they won't be mistaken for white by other characters in the story. The question embodies the fact that the character's identity matters to the story.
Growing up in the southwest amongst people who might be called Latina or Hispanic or Spanish or Mexican or Mexican American, I know that there's a wide range of skin color amongst them, but, because northern New Mexico is an area in which people deeply identify with their specific heritage, I also know that the color of their skin is not what makes them feel Latino/a, or Hispanic, or Spanish, or Mexican, or Mexican American, or.... Pueblo Indian. Certainly, we've all experienced prejudice or acceptance based on our appearance, but I don't think skin color is what any of us would say as one of the first things we say about ourselves.
I think my colleague's larger point is that characters are more than the color of their skin, and I think she's pushing people to dig more deeply so that a character's culture is the defining feature, or, a feature that shapes how they move about in the story. We all know, too, that physical description is somewhat of a default when writers introduce a character. Writers want us to visualize that character's physical presence, but the descriptors used often take the whole story off the rails.
Because this colleague and I have talked before about Native people and our status as members/citizens of a specific tribal nation rather than people of color, I assume she was thinking specifically about people who aren't Native but are "of color."
But, because so many people include Native peoples in the "people of color" framework, I decided to write this post in response to her question.
First--read my post, "We Are Not People of Color" to understand why the phrase doesn't work well when talking about Native peoples. Some of us do have "color" that makes us look, in appearance, like societal expectations of what a Native person looks like (dark hair, dark skin), but some of us don't. This video from the Cherokee Nation makes the point very well:
See the range in appearance that I'm talking about? It makes the case that assumptions about skin color and a Native person's identity are likely to get a writer in hot water. I cringe opening a new book. Invariably, the descriptions of Native characters reflect those assumptions.
I love when Native writers, like Cynthia Leitich Smith, speak back to those expectations in their stories! Here's the opening of her story in Moccasin Thunder, edited by Lori Marie Carlson. Published in 2005 by HarperTeen, Smith's story starts on page 33:
I love that story--and others in Moccasin Thunder, too.
I appreciate my colleague's question about skin color, but I also gotta say it was (for me) a bit uncomfortable. In essence, she was asking "How shall I describe your skin color?" I imagined sitting with someone who wondered what I would like them to say about my skin color. Would they ask the question if we were face to face? As I imagined that conversation, I looked down at my hands and wondered what I'd say. I definitely felt unsettled, imagining the conversation, even though the question is meant to help people avoid pitfalls. I'm usually more than happy to help people with questions, but this one... this morning... it just feels icky. I might be back to this post to say more about that icky feeling later, if I figure it out! For certain, I'd want to be described as a tribal member at Nambe. Indeed, I'm often asked how I should be described for a brochure or poster announcing a lecture I'm giving. I say that I'm tribally enrolled at Nambe Pueblo. That description means a lot. It opens doors to conversations that are rooted historically in the land, and in the political landscape of U.S. government/tribal nations. My skin color doesn't open that door.
An aside about nationhood: Did you notice the people in the video say "I am Cherokee" rather than "I am part Cherokee"? That is important. It speaks to their nationhood. I don't know anyone who says "I am part American." Do you? Or "Part of me is a citizen of the U.S."