Well, I have to chuckle at this question. I have always said that personality is not based on color. It is purely based on what they see from their mother and how much hands on they have with people from a young age. However, I have 4 black females in my herd that are certainly much higher in attitude than my other girls. I was just saying to my husband the other day that if I didn't know better I would swear it comes with the color!
On the other hand I have 2 black velvet males and both are very laid back and gentle.