Question: What colour of hair did Esau have?
Answer: Red. (Genesis 25:25).
Comments: Esau is synonymous with the color red. He was born a hairy redhead. (Genesis 25:25). In fact, his name, Esau, means "hairy" and the other name by which he was known, Edom, means "red" (Genesis 25:30). Edom, the land which took his name, contains an abundance of red rock.
Now the first came forth red, all over like a hairy garment; and they named him Esau. (Genesis 25:25, NASB)
I have always liked to think of Esau as the Bible's best looking character.
Note: This image is the birth of of Esau and Jacob, as painted by Benjamin West (1738-1820).