Hel
1. Daughter of Loki and the giant Angurboda. She is the sister of Fenrir (Fenris-wolf) and Jormungand (Midgard serpent). She is the goddess of the underworld. Her realm was Niflheim and her hall, Elvidnir [misery]. She was described as half white and half black.
Loki
1. A giant. He became a member of the Aesir when Odin made Loki his blood brother. He is the god of mischief, a trickster, and very cunning. After causing the death of Balder, he was bound by the gods until the Ragnarok, at which time, he will be freed.
Some books list Sataere as a Germanic god of agriculture and suggest that the name is another name for Loki. Guerbers' Myths of the Norsemen is one of these books, stating:
Loki was confounded with Saturn, who had also been shorn of his divine attributes, and both were considered the prototypes of Satan. The last day of the week, which was held sacred to Loki, was known in the Norse as Laugardag, or wash-day, but in English it was changed to Saturday, and was said to owe its name not to Saturn but to Sataere, the thief in ambush, and the Teutonic god of agriculture, who is supposed to be merely another personification of Loki.
Njord
1. Old Norse Njörð variant Niord.
God of the wind and sea, also called god of chariots and the giving god. It was to him that those wishing for protection on travels or desiring a good catch while fishing were supposed to pray. He was said to be so rich that he could bestow wealth on any who prayed to him for it.
Odin
1. Old Norse Óðinn
Leader of the Aesir. Odin had a myriad of names including Allfather, Ygg, Bolverk [evil doer], and Grimnir. He also had many functions including being a god of war, poetry, wisdom, and death. His halls were called Gladsheim Valaskjalf and Valhalla. Odin's high seat, Hlidskialf, was in Valaskjalf. It was from this throne that he could see over all the world. Valhalla is where he gathered his portion of the slain warriors, Einheriar (Einherjar), whom the valkyries had chosen
Thor
1. Old Norse Þórr
The son of Odin and a member of the Aesir, he was the god of thunder and the main enemy of the giants. He would smash their heads with his mighty hammer Mjollnir. To wield this awesome weapon he needed iron gloves and a belt of strength. Mjollnir would return to Thor's hand after being thrown and was symbolic of lightning. Thor would ride around middle-earth in his wagon drawn by two goats, His abode was Thruthheim [Land of Strength] and his hall, Bilskinir. His wife was Sif.
Hel
1. The land of the dead. The way to this realm was through the land of the mountain giants. The connection between this and Niflheim is often confusing. Hel is also the goddess of the underworld.