Both hair color and eye color are stored and used as simple text strings, so there is no limit on what they can be changed to.
Each of the races can have it's own colors and is specified in ".../files/scripts/characters/races.gd", which can be opened with any text editor. Humans are used as the default for any race that does not specify their own colors.
The repeatable slave quests use either of these 2 lists for hair color: ['red', 'auburn', 'brown', 'black', 'white', 'green', 'purple', 'blue', 'blond', 'red'] ['blond','black','brown','red']
This list is used for eye color: ['blue', 'green', 'brown', 'hazel', 'black', 'gray', 'purple', 'blue', 'blond', 'red', 'auburn']
