Niko

Niko was a homeless woman who raised Yuri Egin during her youth.

Appearance
Niko is an older woman with short light coloured hair and a somewhat wrinkled face. Her eyes normally appear closed.

Personality
Niko appeared to be a diligent person, willing to work if not for her poor eyesight. She seemed to have a negative opinion of pornographic material, calling it dirty.

Blue Night Investigation arc
Whilst travelling in the past, Rin Okumura observes the life of his mother, Yuri, before she joined the True Cross Order. He watches Yuri live and play in the junkyard before a tragic fire kills Niko, Oku and Obaba, forcing Yuri into the streets alone.

Blue Night Remembrance arc
It is later revealed by Satan that the deaths of Niko, Oku and Obaba were not accidental and were in fact the result of his attempts to possess them, although this ended in failure.