It would be way too obvious to go with Morrigan or Brighid (like, duh), so I’m going to choose instead one of my favourite “Descent to the Underworld” goddesses.
The Descent to the Underworld myth has always held special meaning to me, ever since I first read the myth of Persephone and Demeter. I really identified with Persephone, except I was reading a sanitized version of the myth and I was very young so the sexual aspect of Her relationship with Hades did not occur to me, and I related Her trip to the Underworld every year with my trip to my dad’s place for access every summer.
Persephone’s bravery and sacrifice really stuck with me, and now that I have a different understanding of the myth it’s Her sacrifice and liminality that really resonate for me. My current understanding of the myth is that Persephone chooses to give up Her prior life when She eats the pomegranate seeds. It’s my UPG that it would be pretty ridiculous for a goddess to not know the rule of the food of the Underworld — that She knew, and chose to have to return to the Underworld time and again.
She didn’t choose Hades at first, but He didn’t force Her either. I believe (and again, this is all UPG and personal interpretation of a myth — I do not claim that this is correct) He did kidnap Her, but just took Her to the Underworld to show Her a different sort of life. And She chose to live there half the year.
I realize this seems very “white-lighter” and sanitizing of the gods. I’m not trying to sanitize Hades or say that He’s just big fluffy puppy. I’m just saying I don’t think He raped Her. I think that’s part of the myth because the Greeks really liked rape stories. Just saying. The sense I get of Hades is that He’s largely misunderstood.
Anyway, Persephone still remains a favourite of mine. She walks the edge between Dark and Light, Under and Overworld, Summer and Winter, and so can see both sides of the story. She is Queen of the Dead but also Queen of Summer.