Kogane is a half-demon, half-human fox (also known as a "demon fox") who suddenly appeared at the Misaka Dormitory; mistaking Sogo for Jin, of whom she had not seen for thirteen years. Despite having powers, Kogane despises being a half-demon, and merely wishes to become human, which she is only able to attain by "uniting" with an heir to the Shrine. Though a kiss is capable of allowing her to achieve this ambition, (as noted when Jin and Kogane share a kiss in a closet) it is only temporary, and after a while, she returns to her half-demon form.
It is because of her desire to be human that she does not get along well with her father, Doukan, as he wishes to keep her away from the human world. Despite the fact that she refers to him as a scary person, she seems to be capable of out-muscling him in physical disputes.
Because she was unfamiliar with the human world; having lived in the demon world since her meeting with Jin, (when they were three years of age) she often acts strange around certain articles of the modern world, such as lighters, calling them "fireballs", as well as how to use a Television, which she refers to as a "box", at first. She can hold her liquor and loves deep fried tofu. She also has a high interest in "human" clothing, which is coupled with her desire to become human.