The renowned trickster and shape-shifter, Loki was the offspring of the giants Farbautia and Laufey. He became an important member of the Aesir when Odin made Loki his blood brother, which also explained why none of the gods dared to harm Loki even after all his mischief. A god linked closely to fire and magic, he had a wife, Sigyn, and with her he fathered Narfi and Vali, the latter having the same name as one of Odin's children.

Loki was known for his mischief. He often put many gods in jeopardy by his actions, and later saving them through his cunning. He was a close companion of Thor and Odin, but yet fathered the monsters that would eventually kill them during Ragnarok: Jormungand, Fenris and Hel. All of the monsters were together with the giantess Angrboda. Loki also took the form of a mare and was thus the father of Odin's eight-legged horse, Sleipnir.

His many acts of mischief include the cutting of the hair of Thor's wife, Sif. Indirectly too, he had a part to play in the creation of many dwarf treasures. He nearly caused the loss of the sun and the moon, and the goddess Freyja, during the fortification of Asgard, which he managed to avert in time.

On a darker side, Loki was a malicious god who plotted the death of Balder, resulting in Loki's imprisonment. Loki was chained to three large boulders, with a poisonous snake dripping venom onto him. His faithful wife held a bowl trying to collect the dripping venom, but whenever she went to empty the bowl, the poison would drop on Loki, leaving him twisting in pain, sending out earthquakes across the world.

He would eventually break his chains on the day of Ragnarok, and lead the giants against the Aesir. There, he would die together with Heimdall, the guard of the Bifrost Bridge, where they were to slay each other.