Hel (ヘル, Heru)
Hel is Loki’s daughter and sister to the wolf Fenrir and serpent Jörmungandr and presides in the realm with the same name (the underworld). She was appointed by Odin to be the ruler of Hel (the location).
Her appearance is described as half-black and half-flesh colored, and also has a gloomy, down-cast appearance. She played a big role in the attempt to resurrect Baldr.
The phrase “Go to Hell” actually originated from “Go to Hel” meaning the same thing, which is “go die”, since Hel was the name for both the ruler of the underworld as well as the name of the underworld.