Odin
Allfather
Óðinn
Wōden
Wêda
Wuodan
Wotan
About
Odin is a one-eyed, long-bearded, spear-wielding sociopath wearing a cloak and a broad hat. He is the god War, the dead, Poets, and Magick. When he was not surrounded by his mixed family or the Aesir and Vanir, he was accompanied by animal familiars- wolves (Geri and Freki), ravens (Huginn and Muninn), and Sleipnir (Loki's eight-legged son, who was a horse).
Odin was a seeker of knowledge, disguising himself in many forms to obtain it, but also participating in bodily mutilation if needed as well. Like many allfathers, he helped create the world by slaying the primordial enemies and giving life to the first two humans. He shared his affection of knowledge with his human creations, and he also liked to dress up in furs around Yuletide and break into people's houses via the fireplace. In this capacity, Odin was also the leader of the Wild Hunt, a ghostly procession of the dead through the winter sky.
Odin, most importantly, oversaw Valhalla, where he received half of those who died honorably in battle. The other half went to the goddess Freyja's hall, Fólkvangr. However, Odin would, not so honorably, mess with the lives of the men on the battlefield, like a child playing with toy soldiers. He would skew the results of the battle just to keep himself entertained.
Odin's main downfall was when he believed the Völva's prophesy of Ragnarök. The Völva told Odin that Loki would bring an army of people from Niflheim, Hel's hall of the dead. Odin himself would be swallowed whole by Fenrir, Odin's son Víðarr would kill the wolf, Heimdall and Loki would kill each other, the serpent Jörmungandr would battle Thor and be defeated. Thor would be bitten by the giant serpent and would only take nine steps before collapsing dead from the venom. After this, the sun would become black while the earth sank into the sea, the stars would vanish, steam would rise from the earth, and flames would reach the heavens.
None of this would have ever happened, but it was more likely to happen because of what Odin did to try to prevent it from happening in the first place.