Fenrir

Fenrir (pronounced "FEN-reer") is the wolf son of Loki and the jötunness Angrboda, who is destined to eat Odin during Ragnarök. He is the brother of Hel and Jormungandr, as well as the half-brother of Sleipnir and Jasmine Smith.
== History ==
=== Birth ===
Fenris Wolf was born to Loki and the Jotunn Angrboda along with Jormungandr and Hel. When the gods found out about the three children, they quickly took care of them.
=== Binding by the Gods ===
He was raised by the Aesir until he quickly grew and became a threat and started to rampage across the Nine Worlds. They tried to bind him twice but he broke free both times with his immense strength. The gods then had the dwarves make an indestructible rope to bind him. When they presented Fenris with the rope he became suspicious and agreed to let them bind him only if one of the gods put their hand in his mouth. Tyr volunteered. The wolf bit off the war god's right hand and the other gods bound and muzzled him and left him on Lyngvi until Ragnarök, when he is fated to escape from his bounds. 
== Personality ==
Much like his father, Fenris is manipulative, sly, humorous, charming and very ruthless. He likes to trick those who come to his prison, trying to look harmless and contained, he lures his victims with his charm into getting closer, so he can attack and kill them. He did this to Blitzen's father. Fenrir is also very arrogant, due to the fact that he can't be killed before the Ragnarok, he claims to be invincible. His cruelty extends to the point when he sunk so low as to send wolves to kill Magnus's mother just so that Magnus could become strong enough to retrieve Sumarbrandar in order to free him. This however, proved to be his undoing, as Magnus instead used the sword to retie him, leaving him bound until Ragnarok.
== Appearance ==
In The Sword of Summer, Fenris is described as larger than an average Labrador retriever, but definitely not much larger than a regular wolf which surprises Magnus. His legs are long and muscular, built for running, while his shaggy gray coat swirls with tufts of black. Fenris' eyes shine with a blue light that "sent a xylophone mallet down the back of [Magnus]' ribcage". According to Magnus, Fenris' eyes are colder and more intelligent than those of any predator he'd ever encountered – animal or human. In addition, the wolf's black lips curl in "a very human sneer". Despite Fenris' gleaming white fangs and his utter hatred for the wolf, even Magnus admits that he is a handsome animal. Apparently, his fur only shines after a long bath in the blood of Asgardians.
== Abilities ==
Being one of the triggers of Ragnarök and fated to devour Odin himself during said event, Fenris Wolf is one of the most powerful and feared monsters in existence; the Norse gods feared his power so much, that they decided to chain the beast, so he could not wreak havoc across the Nine Worlds.
* Enhanced Strength: Fenris Wolf has demonstrated great strength.
* Enhanced Agility: He is still menacingly nimble though bound, which showed when he fought Sam (in the form of a lion).
* Enhanced Reflexes: Fenris is fast enough to confront Sam, Magnus, Blitz, and Hearth at once. And the most dreadful pieces of evidence are the remnants who fell to his victims even he's confined to Gleipnir.
* Enhanced Bite Force: The most powerful as well as the deadliest trait is his mouth through which he has the ability to bite off Tyr's hand and swallow Odin whole.
* Enhanced Smell: Fenris Wolf has demonstrated a strong sense of smell as he was able to detect Odin disguised as X. Although, he wasn't sure he was X exactly, he thought Odin might've been one of Magnus' other hallmates.
* Charmspeak: The wolf's voice is described as "deep and rich", flowing over Magnus like molasses, "dangerously smooth and sweet". As a result, he is finally able to understand the fear Valhalla's thanes had of "the silver tongue of Loki’s children". Fenris could even talk Odin into choosing Sam as a Valkyrie and lure the victims to slacken and into his attack range.
* Telepathy: Fenris can give his sons an attack command to get to Magnus and his mother, affecting Odin to designate Sam as Valkyrie in far distance.
* Invincibility: Much like other destiny protected beings who would only be destroyed in certain circumstances, Fenris could only be slayed by Vidar during Ragnarök due to the prophecies of Norns/Fates, which, therefore, is why they're so fearful.
== Trivia ==
* During Ragnarök, Fenris is destined to kill Odin by swallowing him whole, but will in turn be killed by Odin's son, Vidar.
* His name Fenrir means "he who dwells in the marshes".
* According to some legends, Fenris is the eldest of Loki's three children.
* Ragnarök will befall as soon as his two sun/moon-chasing sons, Sköll and Hati, whose names connote "scorn" and "hate" respectively, devour the Sun and the Moon.
* Sköll, Hati, or Mánagarmr may just be his other names.
* Before Magnus saw Fenris for the first time, he claimed to have expected him to be "a wolf bigger than King Kong with flamethrower breath, death-ray eyes and laser nostrils". He was quite disappointed when saw what the real Fenris Wolf looked like, comparing him to when he saw Plymouth Rock, the Liberty Bell, and the Empire State Building.