Hel (Old Norse Hel, “Hidden”) is a goddess in Norse mythology who rules over Helheim, the underworld where the dead dwell.
Much of the specifics of her history were still in the memories she'd sealed off when she'd gone back to being a child, but the effect of the memories on her personality was still there. She was still cynical and bitter despite not having a complete understanding of why. Not much of what she'd encountered this life had changed her mind.
Born in Asgard a daughter of one of the first demonic defectors. However, the Norse Gods of the time had not approved of her withered form and she and her father had both gone back to be amongst the other Demons of Nifelheim along with her Goddess stepmother.
There she hadn't been much respected either, a cripple amongst a people that thrived on physical prowess. Then her father, Loki, had been caught and imprisoned by Gods and Demons both after he'd arranged for Balder to die, and thus killed a Demon as well.
That left her stepmother, Sigyn, to take care of her. The Goddess had doted on Hel, admittedly, but couldn't be around all the time as she had to go take care of Loki much of the time. They'd lost touch a few thousand years ago.