Rewatched the KS video lately, and noticed something funny.
We're pretty used to vikings having horned helmets (despite it being historically inaccurate) so I didn't notice this at first, but there are quite clearly two playable races in the Saga.
The first are regular sized vikings. The second appear to be Giants, who are not only considerably larger, but clearly have horns growing out of their heads, not horned helmets.
They also have different proportions - while they stand about twice as tall as a regular person, their lower legs are very stumpy. I can't see any other differences for the time being.
You can see the giants better starting at the 2 minute mark when we see the animations without backgrounds.
Evidently, the giants are enemies, as well as allies, since the enemies we see the human warrior, wizard, and giant warrior fight are proportioned the same way as the giant warrior.
So. Clearly the giants are very important to the story - the narrator is one, and they appear on both sides of the conflict. They aren't the main characters though, since the player's character is quite distinctly human, and Alette seems to be as well (or perhaps an Elf?).