Odin is a great god as the highest existence in Nordic mythology. He is the father of Brynhildr and the other Valkyries, having created them from Sefar's corpse.
In Fate/Grand Order:
Odin used Cú Chulainn as a proxy to help him save the Human Order, granting him his authority transforming him from a Lancer into a Caster.
In Fate/Grand Order Cosmos in the Lostbelt:
6,000 years ago, Odin foresaw the plans of both Goetia and the Alien God. In order to save the Human Order, he possessed a fairy in the English Lostbelt and used him as a proxy, calling himself "Grímr the Wise".
In Fate:Lost Einherjar:
In the 9th century, Odin gave Ragnar Lodbrok a set of three trials to see if Ragnar was worthy of marrying Aslaug .
