It is generally believed that Lord Ram is blue back in Color.
Ladies in Tami Nadu has a Name for this color, Rama Blue.
It is a mix of Blue and Black.
Valmiki Describes Rama’s Complexion thus.
“Hanuman to Sita.
dundubhi svana nirghoShaH snigdha varNaH prataapavaan |
samaH sama vibhakta ango varNam shyaamam samaashritaH || 5-35-16
16. dundubhisvananirghoSaH= He has a voice like the sound of a kettle-drum; snigdhavarNah= He has a shining skin; prataapavaan= He is full of splendour; samaH= He is square-built; samavibhaktaaN^gaH= His limbs are symmetrically built; samaashritaH= He is endowed with; shyaamam varNam= a dark-brown complexion.
“He has a voice like the sound of a kettle-drum. He has a shining skin. He is full of splendour. He is square-built. His limbs are built symmetrically. He is endowed with a dark-brown complexion.” Sundara Kanda Sarga 35 Sloka 16.
Rama, whose face is like the full moon, of dark brown complexion, whose collar-bone is invisible (because of its being covered with flesh), a conqueror of foes, whose arms descend to his knees, whose eyes resemble lotuses, the elder brother of Lakshmana, who takes initiative in speaking and expresses with sweetness, truthful of speech and possessed of extra ordinary strength, is benevolent to all, delightfully charming as the moon, that tiger among men, as mighty as an elephant in rut, that great car-warrior, will surely adorn the woods, while roaming through them..
(Valmiki Ramayan – Book II : Ayodhya Kanda – Book of Ayodhya: Chapter 48.)
There is a doubt.
Rama was born in Ayodhya, in North India where they are fair skinned.
Dravidians have this complexion.
Yet another twist.
““In the four yugas—Satya, Tretä, Dväpara and Kali—the Lord incarnates in four colors: white, red, black and yellow respectively. These are the colors of the incarnations in different millenniums.
— Madhya 20.330
The yugas are known as Satya-yuga, Treta-yuga, Dvapara-yuga and Kali-yuga. The incarnations of each yuga are of different color. The colors are white, red, black and yellow. In the Dvapara-yuga, Lord Krsna in black color appeared, and in the Kali-yuga Lord Caitanya in yellow color appeared.
–Purport Srimad Bhagavatam 1.3.5.
One has to take Valmiki’s word as final,