It really depends on the type of character I'm playing, I tailor everything about the character to fit with the vision of the character. Brunette is very common however, as I am brunette. I play brunettes when the character is a very average character or personality, or when the character is closely tied to me as a person. They are practical, but still can be brazenly heroic. Example: Kai Carpenter, system Pathfinder, Setting: 14th century Latvia. He was a craftsman with a desire to adventure, but he bit off more than he could chew on it and retired before he could end up dead. I play blondes as fun-loving or carefree characters. Most of my characters are very "heroic" but my blondes have a tendency to go the extra mile on heroism. They have a strong sense of justice offset by a blazee attitude that seems phaseless. Example: Alden Keladry, system FFRPG, Setting: Kingdom Hearts Alternate Universe. He was an amnesiac keybearer of unfailingly good-nature and stupidly heroic, a lot of fun to play. I also have a good number of pale or white-haired characters and I play them as having something that made them to have matured quickly. Every white-haired character I've made has had a tragic past, some have turned hotheaded to offset the tragedy, others cool and calculating, trying to set things back into place. Example: Deianera "Mystery" Andoran, system: Play by post story. Setting: Akin to Roman Colosseum. Mystery was a noblewoman that hated her parents for trying to pigeonhole her into their idea of being female, when all she wanted was to be a soldier like her brother. The last straw was when they arranged for her to marry, she killed them and took her life as her own. She wasn't always white-haired, originally a brunette, but long training in the desert bleached the color out of her hair. She denied everything of being a woman and became a criminal sent to the colosseum to fight for freedom, but she would commit crime after crime just to go back and fight more. Other hair-colors are rare and are brought out only to suit setting or if the character is supposed to stand out for having a more unique hair color. Or if the race I'm playing just happens to have those colors as natural colors, OR the system uses random color generation like MAID RPG.