Shippable: she is very married to Nadia but pre-canon Sapphic ships are a-okay!
Deirdra is from Caer Ellig, which is situated on the coast a bit south of Balochry and Malawi. (Think fantasy Cornwall for geography, and fantasy-mashup-of-gaelic-cultures for everything else.) She came to Vesuvia when she was 15, sent there for her protection by her family. Her primary magic is divination: tarot is her most popular service, but she also has dreams of the future, reads crystals and palms, and is mildly psychic. Do not try to lie to her or hide baked goods from her.
She is, as @vissenta-senadz likes to put it, Lesbian Dolly Parton. She likes it when people see her as a backwater hick and underestimate her. She likes it even more when she gets to use that to blow their ill-informed, bigoted opinions out of the water. She reads voraciously, especially weird metaphysical treatises and romance novels. She is your local mom friend. If you have met her more than once she worries about whether your feet are warm and if you're drinking enough water. Do you want a hug? She hopes you do, because she wants to give you one. But if what you need is a verbal slap on the back of the head, that's exactly what you will get.
She is my lavender-scented softgirl and I cannot overstate how much I love her.
More of her backstory to come via some erotica that caught feelings and then caught plot (whoops).