Mahabharata gives the following description of the Pandava brothers. It does not say if Arjuna was fair or dark.
Thus addressed, Draupadi replied, ‘Having done this violent deed to
shorten thy life, what will it avail thee now, O fool, to know the
names of these great warriors, for, now, that my heroic husbands are
come, not one of ye will be left alive in battle. However as thou art
on the point of death and hast asked me, I will tell thee everything,
this being consistent with the ordinance. Beholding King Yudhishthira
the just with his younger brothers, I have not the slightest anxiety
or fear from thee! That warrior at the top of whose flagstaff two
handsome and sonorous tabours called Nanda and Upananda are constantly
played upon, - he, O Sauvira chief, hath a correct knowledge of the
morality of his own acts. Men that have attained success always walk
in his train. With a complexion like that of pure gold, possessed of a
prominent nose and large eyes, and endued with a slender make, that
husband of mine is known among people, by the name of Yudhishthira,
the son of Dharma, and the foremost of the Kuru race. That virtuous
prince of men granteth life to even a foe that yields. Therefore, O
fool, throwing down thy arms and joining thy hands, run to him for thy
good, to seek his protection. And the other man whom thou seest with
long arms, and tall as the full-grown Sala tree, seated on his
chariot, biting his lips, and contracting his forehead so as to bring
the two eye-brows together, is he, - my husband Vrikodara! Steeds of
the noblest breed, plump and strong, well-trained and endued with
great might, draw the cars of that warrior! His achievements are
superhuman. He is known, therefore, by the name of Bhima on earth.
They that offend him are never suffered to live. He never forgetteth a
foe. On some pretext or other he wrecketh his vengeance. Nor is he
pacified even after he has wrecked a signal vengeance. And there, that
foremost of bowmen, endued with intelligence and renown, with senses
under complete control and reverence for the old - that brother and
disciple of Yudhishthira - is my husband Dhananjaya! Virtue he never
forsaketh, from lust or fear or anger! Nor doth he ever commit a deed
that is cruel. Endued with the energy of fire and capable of
withstanding every foe, that grinder of enemies is the son of Kunti.
And that other youth, versed in every question of morality and profit,
who ever dispelleth the fears of the affrighted, who is endued with
high wisdom, who is considered as the handsomest person in the whole
world and who is protected by all the sons of Pandu, being regarded by
them as dearer to them as their own lives for his unflinching devotion
to them, is my husband Nakula possessed of great prowess. Endued with
high wisdom and having Sahadeva for his second, possessed of exceeding
lightness of hand, he fighteth with the sword, making dexterous passes
there with. Thou, foolish man, shall witness today his performances on
the field of battle, like unto those of Indra amid the ranks of
Daityas! And that hero skilled in weapons and possessed of
intelligence and wisdom, and intent on doing what is agreeable to the
son of Dharma, that favorite and youngest born of the Pandavas, is my
husband Sahadeva! Heroic, intelligent, wise and ever wrathful there is not
another man equal unto him in intelligence or in eloquence amid
assemblies of the wise.’
Mahabharata, Vana Parva, Section CCLXVIII
Mahabharata says the following about Draupadi.
Yudhisthira answered the chief of the deities once more, saying, - ‘O
conqueror of Daityas, I venture not to dwell anywhere, separated from
them. I desire to go there where my brothers have gone. I wish to go
there where that foremost of women, Draupadi, of ample proportions and
darkish complexion and endued with great intelligence and righteous of
conduct, has gone.’
Mahabharata Mahaprasthanika Parva Section III
