You get a chain, but you can only ever have blacks as companions and followers. Meaning not people named "black" e.g. Sirius Black, but as in resembling the group of allegedly sapient creatures who live in West and Sub-Saharan Africa or their descendants. They will always be imported as blacks, and you cannot change their phenotype either by import or manually (e.g. via biomancy, illusions, etc.), though they can still can appearance perks as long as they remain obviously black, and they can still take non-human or human-adjacent species options, albeit still bound by the same conditions that apply to appearance perks. You may take canon companions as normal, though they will have always retroactively been black. You do not have to be black yourself. You may attempt to change their personality, demeanor, or mannerisms as normal for companions.