If you had to worship one god of the Northern pantheon....

[Mad Humanist]

On that basis we can already begin compiling a list! (I'm actually a little surprised a thread for this hasn't already started, but I guess it would immediately be derailed by Banjo/Giggles/SSGoW claims)

Bragi and Idun have already been mentioned as missing from the current list of Norse gods.

Jormungandr? Surtur? Ymir? (Easy to see why Hel would get the advantage!)

I want to wait for some hard information. Partly so it is about OOTS and not Norse mythology, and partly to see a resolution of the speculation over non-Norse demigods. If you want to vote for demi-gods now, fine, but I won't compile a list until the comic gives us a decent amount of hard data.