This is a topic near and dear to my heart. I’m white or if you prefer Caucasian. My hubs looks white but is Creole, which is a mixture of African American, German, and Cuban. His family hails from Texas via Louisiana and my children are a mixture of us. None of us has dark skin. However, I love my husband’s family, which runs the spectrum from dark African American to light, Latina, and Asian. Because of this, I always write characters that reflect one of them as I feel they are so underrepresented in literature or stereotyped. Recently, an agent, Saba Sulaiman addressed the question if someone should “throw” diversity in their manuscript to make it more marketable. She provided the best answer I’ve seen. If you’re wondering the same thing, I recommend you check out her answer at Pub Hub.