Who is Yevonna from Notes of a Dirty Old Man and what is their importance?

Yevonna is one of the latter characters in the story. Yevonna appears to represent Bukowski's luck with women. At first, Yevonna is a dream for Bukowski, but upon their marriage, Yevonna changes drastically. She becomes more interested in mysticism than in being a wife, and often wears the same clothing and does not clean, cook, or work.