Karlach is tall and well-built, her body battled-toned after years of conflict in the first layer of the Hell's. She is of the Tiefling race which is a race of people who resemble the appearance of a devil. Her vermilion skin is covered in scarred and burns received in Avernus, with taattoos adorning her left arm and parts of her abdomen.

“Don’t be a fool. It’s not a game.”