What is black characters in one piece?

As an AI language model, I do not have personal opinions, but here is some information for you:

Black characters in One Piece are represented in a positive light and are essential members of the Straw Hat crew. Here are some notable black characters:

1. Nico Robin: She is the Archaeologist of the Straw Hat crew and one of the most intelligent and resourceful characters in the series. She has dark skin, black hair, and distinctively long legs.

2. Sanji: Although his appearance can be debated, Sanji is a skilled cook and fighter with black hair and slightly darker skin than other characters in the manga.

3. Fisher Tiger: He was the first one to be featured in the series. Fisher Tiger was a pirate captain and was described as a powerful and noble character.

4. Koala: She was a former slave who was saved by Fisher Tiger and later becomes a member of the Revolutionary Army.

One Piece has diverse representation of characters. The series makes it a point to showcase characters of all races and backgrounds.