Nymphadora Tonks's hair changes colour with her mood.
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Bright colours are happy, cheerful
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Dark colours are neutral, expressive.
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And natural colours?
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Natural colours are just depressed.
Remus Lupin had never allowed himself to love. He couldn't. His lycanthropy was a danger to anyone who got too close. But Nymphadora Tonks didn't care. And, seeing the love was mutual, she refused to accept no for an answer. In times of war, where everyone is out of their minds, in a world of death, sorrow, and darkness, Tonks brought a little colour into Lupin's world.
(A "Remadora" fanfic)