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Thus far, there are two: Persephone and Leukothoe.
Would it benefit me to include Charon in that brief list? Though venal, he has never been quite so volatile as the others. Dutiful, loyal. Steadfast.
But also a sure link to Thanatos. Hm. Better Charon and Thanatos than that arrogant son of Zeus's - these two who have shared my home since time immemorial.