I might have come up with it in the top of my head, about the long forgotten twin sister of the Norse god of Mischief, Loki. Her name goes by Ymin, the soon to be Empress of the Jötnar. Her being much more than an obstreperous child of Odin that makes her brother, Loki proud by helping him in his mischief, was a detriment for Odin and his family of gods.
In fact, in her latest act before Ragnarok left Odin with no choice, but ultimately lock her up in chains far beneath the largest ice cap of Iceland named Vatnajökull on the hopes that she would no longer cause any malfeasance upon Asgard again. Unfortunately, since the end of the