>>715147201
>>715147270
>>715147392
>>715147494
>>715147608
Just go with 黒んぼ (Kuronbo).
It actually means as close as possible you can get to the English word 'Nigger'.

The word itself could mainly also be translated as "Darkie" , "Sharty skinned" , but the definition is quite literally that of a slur for black skinned slaves that appeared throughout 19th century Japan after they were opened up by American again and had them come in there with their slaves.