For comics I would say Gabe Jones of the Howling Commandos.
For TV, Kinchloe in Hogan’s Heroes?
…and no I don’t remember anyone complaining about ‘forced diversity’. I would guess plain ol vanilla bald-faced racism trumped that in them thar days.
And no, I don’t consider any of The Little Rascals or Franklin to be ahistorical. Franklin from experience and I could be utterly wrong about The Rascals. But I don’t consider it utterly impossible that a group of impoverished kids could be so diverse.*
Now…said kids dragging a mule into a rich white woman’s home without serious repercussions?
*But i could be wrong. I know on the face of it that what Hal Roach did was daring.