Kayaba Akaneko

Position of the mark: On her butt
Curse:

Spoiler

Forbidden to have any direct physical body contact with other people

Gift:

Spoiler

Ability to discern lies

Possessing an indispensable ability, her own father tried to sell her to pay for debts. She, however, managed to escape which leads her to meet other cursed people.
Being literally unable to experience the warmth and love of a person, being exposed to the cold reality of the world she is living, to inescapably see other's unmasked faces and discerning the truths she doesn't even wish to know, all she could do is pour her embrace to cats.