Ebony and Ivory are brothers. Ebony is the older one, and as such, more of the leader, the calmer, more level-headed, patient one of the two, while Ivory is more headstrong, impulsive, impatient, and fun-seeking. They are separated by less than a year of age, and as such, can very nearly read each others thoughts, and can read each others body language with absolute certainty.
Both have black hair (neatly combed back), both have jade-green eyes, and they look nearly identical. They both have a taste for sharp dressing and the finer things in life, and while Ebony prefers to wear white clothes with black accents, Ivory prefers to wear black clothes with white accents.
They generally keep to themselves, but don't object to company.