Sinner has a real name but it is yet not revealed. Sinner is a holy being made of pure innocence and light. She's a Primordial of Sins as she judges people's sins and decides if they should be reborn as a gift, revived as a gift. Or banished to the afterlife as a punishment, be banished to the dimension of sinful souls as a punishment too. She's the actual mother of the Primordial of Purity. Whose nickname is Purity. She dislikes Eternity and Immortality due to them taking her kid from her.