Teddy is a metamorphmagus, so he can change his hair colour just like Tonks can. Remus tells the Order members at Shell Cottage that Teddy's hair looked black when he was born, but later began to look ginger. He says that he expects Teddy will be blond by the time he gets home. In the photograph that Remus pulls out just before the Battle of Hogwarts, Teddy has turquoise hair, which is why he is often depicted this way in fanart, etc.
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Teddy Lupin
John.
The color of his hair is brown. You can see his natural color in his eyebrows.
Hair gets it's color from melanin pigments found in your hair's cortex.
Her natural hair color is a dark brown or black if you see her sister she has black hair and so does Nikki Dee.