Odin is considered the chief god in Norse mythology. He is associated with wisdom, war, battle and death and also magic, poetry, prophecy, victory and the hunt.
He only has one eye because he bartered the other in order to drink from the well of Mimir and gain its knowledge. He had many abilities like astral projection, shapeshifting and control of the elements and weather. He also could read magic runes that no one else could since he had hung himself from the World Tree Yggdrasill while inflicting self-torture in order to gain great knowledge.
Odin is the chief god of the Norse pantheon. He and his brothers Ve and Vili killed the frost giant Ymir and built the world from his body. He is also the father of most of the gods, including Thor and Baldur, who was later killed by a manipulated Hod with a dart of mistletoe. He is associated with his spear Gungnir, the two ravens Hugin and Munin, and the eight-legged horse Sleipnir. In Ragnarok, he gets devoured by the monster wolf Fenrir.
"The chief god of Norse mythology. He is the god of war and death, skilled in magic and deeply associated with poetry and song. Odin is often depicted with long, white hair, missing one eye, and holding his spear Gungnir. It is said none can match his prowess in magic, though he was once a pupil of the goddess Freya. Ever thirsty for knowledge, Odin will not hesitate to sacrifice to gain it. It is said he achieved wisdom by offering one of his eyes to the giant Mimi and drinking the Water of Knowledge from the roots of Yggdrasil. Odin lives in a great hall in Valaskjálf, home of the gods. From his throne Hlidskjalf he peers down at the world below. Whenever he sees brave warriors die in battle, he sends his warrior maidens, the Valkyries, to gather their souls and bring them to Valhalla, where they prepare for Ragnarok, the end of the world. At Ragnarok, Odin is fated to be swallowed by the giant beast Fenrir."
—Shin Megami Tensei IMAGINE Compendium
Odin can only be acquired through triple fusion, but does not require a plug-in. He appears as the boss of Shibuya's Celu Tower silver-level instance and can be summoned by Thor in the boss room of the gold instance. He possesses a unique skill in Gungnir, an almighty shot with fast incantation and cooldown. He also acts as one of the two key-bearing mini-bosses that players must defeat in order to summon Metatron in Shinagawa Diaspora.
Odin appears in the Challenge Quest, Save the Old Man. He has turned into a old human man and has lost his memories and wishes to tell a story to Flynn about the King of Heroes Wodan. Thor under a fake identity sends Flynn and two other hunters to fight before him to restore his memories and fights him. After the battle Odin halts the fight, revealing he has regained his memories and recovers his true form. He returns to Asgard alongside Thor, but promises that the humans who helped him they would be allowed to go to Valhalla after their deaths.
"In Norse lore, he is the father of the gods, as well as the god of wisdom. He rides his eight-legged horse Sleipnir, wields his spear Gungnir, and wears the ring of Draupnir. He freely sacrificed an eye to drink from the Well of Wisdom. He also welcomes the souls of warriors to Valhalla."
—Devil Summoner: Soul Hackers 3DS Compendium
Odin is one of the only two demons (the other being Amazon) to have the Demon's Intimidation skill, which greatly lowers attack power of opponents.
In the 3DS remake, a variant Odin can be unlocked through Nemechi's male angel form, at a cost of 300 D-Souls. He uses his design from the first Devil Summoner installment. This version is more focused on physical attacks. Both versions can be transformed into a Soma with Mystic Change.
"Silver spear engraved with runes. Strengthens Elec attacks."
With the addition of Weapon Fusion in this edition of the game, it is possible to fuse Odin with any kind of Nihil Weapon to obtain Gungnir, his legendary spear. It has an attack value of 310 and a hit rate of 97. His Heart Item is Draupnir, his ring. It doubles the effects of healing spells.
Odin is the ultimate persona of the Emperor Arcana. He learns the highest tier wind spell, Panta Rhei, which inflicts severe wind damage upon a single enemy. The spell cannot be passed on through fusion.
"In Norse lore, he is the father of the gods, as well as the god of wisdom. He rides his eight-legged horse Sleipnir, bears his spear Gungnir, and wears the ring of Draupnir. He freely sacrificed an eye to drink from the Well of Wisdom. He also welcomes the souls of warriors to Valhalla."
—Devil Survivor 2 Compendium
Odin is a Unique demon that doesn't require a particular fusion combination to create. Instead, the player has to achieve a Fate level of 3 with Fumi Kanno before it is available.