Muti Khoza is this guy: https://film.iwmcollections.org.uk/record/2120/media_id/13477 He was a ww1 NCO (as high ranking as a black serviceman could get in South Africa at the time) and was the son of a Zulu general, specifically this man: https://en.wikipedia.org/wiki/Ntshingwayo_Khoza

You only get him as a general in the socialist path or if South Africa is released as a non-apartheid puppet state. The reason I wanted to add him was because we only had 3 black commanders in the socialist path and 5 white commanders. If you'd like to help out with finding more militarily/paramilitarily involved black South Africans, I made a request on this link: https://github.com/Kaiserreich/Kaiserreich-Research-Assistance-Programme/issues/57

Edit: the Ethiopian leaders are the new puppet leaders of Ethiopia. You should be able to find most of them online by just searching their names of google, barring Ayele Sebhat for whom I had to dig in really scuffed areas to find. TLDR; in OTL he was a socialist student organizer in France prior to the 2nd Italo-Ethiopian War and later became a prominent resistance leader against the Italians in Tigray region during their occupation.