That is not a hair color term, nor a way you should use it
"Raven" is kind of iffy as a hair color term. It's not wrong, it's just sort of in the realm of purple prose.
Calling a person "the raven" in the same way you'd call a person "the blonde" or "the brunette" makes me want to scream.
Calling a male person "the ravenette" makes me want to stab my eyes out.
Unfortunately, I think that calling a male "the ravenette" is catching on, especially in the Naruto fandom but elsewhere as well. The examples I've listed below are only a small sampling.
Note: I've kept the quotes relatively tame but a few of the fics themselves contain triggering issues such as non-con or dub-con, so click on the links to individual fics at your own risk.
Kuroshitsuji fandom
http://www.fanfiction.net/s/5782289/1/Where_Claude_Came_From contains:
The ravenette grinned, smug. He didn't intend to drink away his miseries with Grell- oh no.
Digimon fandom
http://www.fanfiction.net/s/5439412/1/Of_Sharing_Beds_And_Shirtless_Brunettes contains:
Soon enough, the brunette was snoring. Kouji rolled over and looked at the boy. His mouth was agape and his nose was twitching slightly. The ravenette let his eyes wander lower and he felt his face go red when he saw the sheets pooled around his pelvis.
Final Fantasy VII fandom
http://www.fanfiction.net/s/6206386/1/Final_Fantasy_VIIIpod_Fun contains:
But Cloud had never really belonged to him, had he? He'd still loved Zack, even though the ravenette was long gone and dead.
Death Note fandom
http://www.fanfiction.net/s/6232046/1/And_Your_Name_Is contains:
Light ignored L, grabbing him by his wrist and forcing the ravenette after him.
And then a bunch of Naruto examples:
http://www.fanfiction.net/s/6325123/1/Wonderland contains:
By now the ravenette was disarrayed, his hair sticking up at odd ends, his clothes had patches of dirt and his expression showed, him being completely wide-eyed with his mouth slightly agape.
http://www.fanfiction.net/s/5596634/1/Christmas_Lemons_SasuNaru contains:
He had already done Sasukes bed, and the ravenette was lying down on it reading.
http://www.fanfiction.net/s/3963991/1/Nintendogs contains:
The ravenette broke free from Naruto's locked arms and stood up, brushing invisible dust off of his coat.
http://www.fanfiction.net/s/4546492/1/Dominate_me contains:
Naruto foolishly challenged the ravenette; sparking his interests with the word 'anything.'
http://www.fanfiction.net/s/3246128/2/The_Truth_of_All_Truths contains:
Naruto arched up into Sasuke as the ravenette bit down lightly on his collar bone.