is there any alternative to using negro in this case as it is considered an n-word?
How do you say black guy/girl in español?
I don't believe that there is an alternative in Spanish, nor does there need to be one. In Spanish, one's race is described with a color. And the Spanish term "negro" is not considered to be an "n-word" as it may be in English.
Well, if they are from the US, you can use afroamericano/a