Edit
Skin that is darker in tone than the usual Caucasian/East Asian skintone. Characters usually have this skintone naturally, but sometimes have dark skin due to a tan, alternate coloring, etc.
A good example of a character with dark skin is Shihouin Yoruichi, from Bleach.
See also
The following tags are aliased to this tag: brown_skin (learn more).
The following tags implicate this tag: dark-skinned_female, dark-skinned_male, and very_dark_skin (learn more).