Odin

Odin is a powerful summon in the Final Fantasy franchise, and first appears in Final Fantasy III. He is based on the, and is usually seen riding a horse. Odin wears steel armor and a helmet that obscures his face and has horns protruding from it. Odin sometimes wears a cape, and he carries both a round shield and a scimitar (although in some games, Odin can also use a lance-type weapon named Gungnir).

In many games, Odin's ability is Zantetsuken, in which he slices through enemies with his sword, cleaving them in two and inflicting Instant Death upon them. Otherwise, if the enemy is invulnerable to Instant Death, Odin deals regular damage to them.

Final Fantasy IV
In Final Fantasy IV, the King of Baron becomes Odin after he is killed by Caignazzo. Odin is fought as a boss in the basement of Baron Castle after the party visits Feymarch and defeats both Leviathan and Asura. By defeating Odin, the party obtains him as a summon.

During a battle, Rydia can use 45 MP to summon Odin. When summoned, there is a chance that Odin might instantly defeat every enemy.

According to a book in the Eidolon Library, Odin was victorious and undefeated until he raised his sword in the air and got struck by lightning. This explains why Odin is weak to Lightning in his boss battle.

Final Fantasy V
In Final Fantasy V, Odin is fought in the basement of Bal Castle. During the battle, the party has only one minute to defeat Odin or else he uses Zantetskuen to kill all of them. Once defeated, the party obtains Odin as a summon. Like other summons, Odin can be summoned by the Summoner class.

Summoning Odin costs 48 MP, slightly higher than in Final Fantasy IV. If summoned, Odin uses Zantetsuken to instantly kill every enemy, although if they are immune to Insant Death, Odin instead uses Gungnir, in which he throws a large Gungnir at every enemy.

Final Fantasy VI
In Final Fantasy VI, the Odin magicite is found in the Ancient Castle in the World of Ruin. He was the guardian of the Ancient Castle during the War of the Magi, which took place 1,000 years prior to the game's events. The Ancient Castle also has a petrified statue of its Queen, who had been in love with Odin since the War of the Magi. When the party examines the Queen's statue, she sheds a tear on the Odin magicite, transforming it into the Raiden magicite. This is the first game in which Odin is not fought as a boss.

Once the Odin magicite is equipped by a character, it costs them 70 MP to summon Odin once per battle. Like in Final Fantasy V, when Odin is summoned, he uses Zantetsuken to immediately kill every enemy. Odin teaches Meteor at a 1x rate to the character who has him equipped.