Kari

Kari is a one-time female human character who stared as the main character for the first half of a short Naught-based story called 'Come To Daddy'. She had the Logos Seed inserted within her while having sex with Naught (so drunk at the time that she didn't even seem to realize Naught was headless), and since the Logos Seed was not able to grow within her, and its dark poison began to contaminate her body, Naught proceeded to rip the Seed out of her heart, killing her.

Due to the fact she was able to see Naught, this may imply that she possesses Pure Darkness in her heart, or it could just be that Naught willingly made himself visible to her.