Off the top of my head and my Star Trek card/autographed photos collection, I can think of a number of non-white genuine actors who have been in that TV series and the follow-up movies.
Robert Hooks - A Commodore
Moses Gunn? - a senior Federation official - The Voyage Home?
George Takei - Japanese American
Nichelle Nichols - black, I’m not in a PC mood tonite
Frances Nuyen - Vietnamese, “Elaan of Troyius” and my favorite scarf-shirt wearer (She made her blouses out of her multicolored scarves and ever time I met her, she had a different one on).
Michael Dohrn - black - ST:TNG
Levar Burton- black - ST:TNG
Alex Siddig (Siddique) - North African/Sudanese or Egyptian, DS9
Penny Johnson - black - DS9
Whoopi Goldberg - black - Guinan ST/TNG
Rosalind Chao - Keiko Ishikawa O’Brien, ST/TNG - Japanese
? - Nurse Alyssa Ogawa - Japanese
Avery Brooks - black and a great Shakespearean actor - DS9
Cirroc Lofton - STDS9 - black
Tim Russ - black - Voyager
Robert Beltran - Hispanic - Voyager
Roxanne Dawson - mixed Hispanic and other - Voyager
Garrett Wang - Chinese - Voyager
One actor in Babylon 5, male
Others - Kang (Chinese); another Chinese conqueror; etc.
Gene Roddenberry and his writers were not racists at all. In fact they pioneered the integration of “colored” actors into television as just parts of a normal space exploration crew.
And the Sci-Fi people loved it! That is what makes America so great - we can put all different kinds of people together and come out with great scientists, teachers, military leaders, athletes, business people, a few politicians, actors/actresses, and even conservative black writers.
Roddenberry saw much further into the future of America and the world than did almost any other writer, and made Sci-Fi more than just entertainment. It also made you think.
Thank you Gene wherever you are “Out there, 3rd Star to the Left”.
Hard to believe you missed the redoubtable Brock Peters, who played Admiral Cartwright in the movies and Benjamin Sisko’s father on DS9.
Apparently he found it very difficult to play such a xenophobic character as Cartwright in Star Ted VI, even though the major theme of the film is overcoming old prejudices.