[Galadriel55]

I cannot resist.

"... I asked because I doubted what here seems believed; for little indeed do you resemble the kin of Hador, whatever your name."

"And what do you know of them?" said Turin.

"Hurin I have seen," answered Arminas, "and his fathers before him. And in the wastes of Dor-lomin I met with Tuor, son of Huor, Hurin's brother; and he is like his fathers, as you are not."

"That may be," said Turin, "though of Tuor I have heard no word ere now.But if my head be dark and not golden, of that I am not ashamed. For I am not the first of sons in the likeness of his mother; and I come through Morwen Eledhwen of the House of Beor and the kindred of Beren Camlost."

"I spoke not of the difference between the black and the gold," said Arminas. "But others of the House of Hador bear themselves otherwise, and Tuor among them. For they use courtesy, and they listen to good counsel, holding the Lords of the West in awe. But you, it seems, will take counsel with your own wisdom, or with your sword only; and you speak haughtily. And I say to you, Agarwaen Mormegil, that if you do so, other shall be your doom than one of the Houses of Hador and Beor might look for."

~COH, The Fall of Nargothrond

I think that having black hair also has some symbolical significance (being the black sheep?), although its not the most important thing.

At length [Tuor and Voronwe] came in their journeying to the Pools of Ivrin, and looked with grief on the defilement wrought there by the passage of Glaurung the Dragon; but even as they gazed upon it they saw one going northward in haste, and he was a tall Man, clad in black, and bearing a black sword. But they knew not who he was, nor anything of what had befallen in the south; and he passed them by, and they said no word.

~The Sil, Of Tuor and the Fall of Gondolin

Here we have the pair going in different directions. Also symbolical.

Originally Posted by Gwath

Turin was loved by Elf princess, and consequently was hated by Gwindor

I don't think Gwindor hated. He was bitter about it, but he didn't hate Turin.