You keep forgetting about Rangarok.

This is, in Norse Myth, the end of the world. Can't say i know much about Norse Myth though, even though i am from the region.

And Fenrir and Jormungand found in other FF's are also from Norse myth.

The one thing that bothers me the most about the references to Norse Myth is how they picture Odin.

In the FF's Odin rides a six legged horse and has a stupid helm with horns, he has two eyes and his ravens are nowhere to be found.

Sleipner, Odins mount, is an eight legged horse.
Odin only had one eye, since he willingly sacrificed one of his eyes to gain knowledge.
His ravens, Hugin and Munin, where his eyes-and-ears on Midgård (Middlearth for all you out there)(Midgar in FF VII also being a reference to Norse Myth) where the humans lives.

One thing that i'd like to see in a future FF when you summon Odin is seeing his ravens hovering over the poor victim. They then fly back to Asgård (where the gods from Norse Myth lived) and sitting down on each of his shoulders telling him of what they've seen. He then rides out from Asgård and strikes down upon the enemy.

That would make me happy.