Fenris: Offspring of Loki and Angerboda. Fenris the wolf, stayed at Asgard. He grew until the Aesir grew afraid of him afterwhich they bound him till the day of Ragnarok.

Garm: The hell hound guarding Hel. Garm and Tyr would kill each other at the day of Ragnarok.

Hel: Daughter of Loki and Angerboda. She rules the underworld, Niflheim, after Odin had sent her there.

Jormungand: Child of Loki and Angerboda. Odin threw the serpent into the sea surrounding the world where he grew until he curled right around the world. Also known as the Midgard Serpent.

Nidhogg: The giant serpent gnawing at the roots of Yggdrasil. At Ragnarok, the serpent would finally chew through a root.

Skoll and Hati: The two wolves who chase Sol and Moon around in their daily cycle. On the day of Ragnarok, the wolves would finally consume the gods.