If not racists then something. Black is not the only interracial group, or however one would say it, out there. you never see Spanish, Asian, Indian, Native ETC., why is that? Been wondering why for a while now.
Racist :
Someone who believes that their race makes them better, more intelligent, more moral, etc. than people of other races and who does or says unfair or harmful things as a result (Plus to discriminate on any facet of a person : skin, hair, eye colour, belief, culture, race, sexuality, heritage, opinion, dress, work, class, parentage, height, size, disability. excluding positive discrimination not allowing people who are on sex offenders lists work with children or the vulnerable, height, disability or qualification would make it impossible to work, and the like)
Commonly creative works (Fictional) are exempt to being classed as discriminating as they are not real.
You are not racist because you make a character with characteristics of a race or made up, the characters you make are not real if you applied those rules to characters than many on this site would go to prison and anyone playing games, reading books and watching movies would also go to prison, this is what we in reality call knowing the difference.
Character = Fictional
Person = Real