Some of these have sets on Tumblr rather than on IJ; it's just late enough that I don't feel like coding up links everywhere.
Asian: Adrian Peng (Chinese), BD Wong (Chinese), Joel de la Fuente (Filipino), Aasif Mandvi (Indian), Stephen Lobo (Indian/Iranian), Hiro Kanagawa (Japanese), Hiroyuki Sanada (Japanese), Koseki Yasuhiro (Japanese), Ahn Sung-Ki (Korean), Archie Kao (Taiwanese)
all my 40+ black PBs turned out to be African American: Morris Chestnut, Christopher Jackson, Lance Reddick, Henry Simmons, Tobias Truvillion, Malik Yoba
Indigenous North American: Gil Birmingham (Comanche), Graham Greene (Oneida)
Latino: Edward James Olmos (Mexican), David Zayas (Puerto Rican)
Pacific: Dennis "Bumpy" Kanalele (Hawaiian)
Mixed: Alexander Siddig (Sudanese/white), Patrick Gallagher (Chinese/white), Anthony Ruivivar (Chinese, Filipino, white), Andre Royo (African American/Cuban), Manu Bennett (Te Arawa, Ngāti Kahungunu, Irish), Taika Waititi (Te Whānau-ā-Apanui/Jewish)