I've got three brown OCs:
Haru, one of the main protagonists of my series, is a haafu. She is half-Tamil, half-Japanese. She has an Indian Tamil dad and a Japanese mom. Even then, Haru is more likely to refer to herself as Indian than Japanese.

Next, we've got Sarah. Sarah is a Parsi of Indian origin. Even though she grew up in Liverpool, her parents are of Indian descent.

Finally, we've got Juan, an Argentinian. Argentinians are Latino, too, I guess.

Feel free to let me know if you disagree with these categorizations.