A "person of color" is, of course, someone whose skin is colorful. Not muted/drab tones like white/black/grey/tan/brown/beige.

Must be their natural, inherited, lifelong skin tone. Must be most of their body, not just a small patch.

I will only count people for whom I have strong evidence of their color; ideally a photograph. Verbal or artistic descriptions can count but only if it's unambiguous that they were a shade that qualifies. People take a lot of liberties when describing skin tone (no humans are actually "white" or "black"), and people find it remarkable and worth exaggerating when someone is even only slightly different from the norm. So I don't trust simple statements of color like "she was blue", since that probably just means "she was slightly bluer than the human average of 'not at all blue'".