Mushibugyo (OVA): Kuroageha

She's the Magistrate of the Mushibugyo. Her body produced a powerful toxic which can kill any living being who touches her. She is once friendly to others and kind to all creatures, no matter how ugly as some have described. The reason why she is emotionless is because after tragedy struck from her house being invaded, she was killed but later brought back by a worm-like insect she had previously saved and cared for, out of pity for it, which gave her immortality. This is only on the first OVA.

A GIF