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Mictecacihuatl is Mic's wife and is said to have the role to watch over the bones of the dead and preside over the festivals for the dead. She was represented with a fleshless body and a jaw agape because she supposedly swallows the stars during the day. I thought I'd combine that with a hint to the modern festival and the well-known face paintings for the Dia de los muertos and gave her this appearance.
I also think that while Mic prefers the spider, she prefers the barn owl as a familiar and transformation choice.
To answer the question a lot of you will surely be thinking now:
Both gods being gods of death and decay, they do not have a relationship based on overly romantic feelings, because they do not live to create, hence have no drive to reproduce or in other words, have sex. In fact, they both are very far removed from anything resembling sexual activities. That's why Mic is very slow in realizing the extent of his feelings, and why his wife is not jealous of Metz. They share a completely asexual, but still caring, marriage.