The Asgardians Left Behind

Odin, Loki, the Warriors Three, Sif, Heimdall, Frigga.  That's a pretty impressive group of gods populated Asgard, and those are only the ones in the movie.  The comics has an even wider supporting cast, and now we're going to look at the other Gods who didn't make the cut, and how likely it is to see them in a sequel.

Balder
Thor's other brother.  The one who isn't a murderous, duplicitous bastard.  Balder the Brave is one of Thor's most stalwart allies, eternally loyal to his kingdom and the path of good.

Chances We'll See Him: Moderate to Low.  Thor already has a healthy stable of BFFs in Asgard, and I think it would be wiser to develop them first before expanding the number of characters.  That being said, if Marvel wants to use Ragnarok as a potential story, it would be smart to introduce Balder.  His death foretells the beginning of the Norse end times, and that's certainly a story worth telling.


Tyr
The God Of War, Tyr has usually stood alongside his fellow gods against the enemies of Asgard.  Although a relatively minor character, Tyr has been tricked into joining of of Loki's plots now and then.

 Chances We'll See Him: Very Low.  Unless he gets an overhaul as a villain, don't expect him to show up on screen.  Balder is a much more likely addition, and sadly Tyr adds little that the rest of Thor's cast doesn't already bring.

The Enchantress and the Executioner
9 out of 10 times when something bad happens in Asgard, you can blame Loki.  The other 1 out of 10, blame the Enchantress.  Frequently a love interest of Thor, she also has a nasty habit of trying to murder him.  It's true love.  She brings along Skurge the Executioner, her loyal protector and complete badass.  Together, the two can challenge Thor and pack a damn unstoppable one-two punch.

Chances We'll See Them: Moderate.  The pair could be a great foe for Thor, but they sometimes struggle to produce the grand, epic threats that Loki does.  And we certainly don't need the Enchantress as a love interest.  One of the more likely routes for a sequel, but far from definite.

The Valkyrie
I love comics.  In a world of crazy space viking gods, Marvel decided to base their Valkyrie almost directly off of the Richard Wagner opera.  Brunnhilde, like most gods in Asgard, just loves war.  It's totally her thing.  This will sometimes make her into somewhat of a bother, but she's also on of Odin's greatest warriors.  And she's currently working for Captain America in the comics on his covert Secret Avengers team, so she has that going for her too.

Chances We'll See Her: Very Low.  Much like Tyr,the Valkyrie is very cool but adds little else story wise.  I don't see a Valkyrie centric story line that offers Thor any good character development, and with Sif owning the the "badass warrior goddess" role, Brunnhilde will just have to settle for the comics.

Hela
Goddess of Death, and one of the most powerful Gods in the Marvel Universe.  Although technically not an Asgardian, she's still a god, so close enough.  She commands the legions of the dead, and has tried to destroy Asgard on more than one occasion.

Chances We'll See Her: Pretty High.  Hela is one of Thor's greatest enemies, and one that can provide a plausible threat to the God of Thunder and all of Asgard.  With the legions of the underworld at her command, Thor will need every ounce of godly blood in his veins to stop her.  Seeing Thor journey into Hel would make for an incredible follow up adventure, and something Marvel should seriously consider.