If you want make Vikings theme story then the Vikings (TV series) is a good example the theme. Not like same thing you make, but you get some idea how the people worship Norse mythology gods and how they applied it to their daily lives. Also a slave and a free man is treated differently in their point of view. For Odin they shall fight with honor and not fear death for they want to go to Valhalla.
Also the TV show has funny clash when the Vikings invade England and they are baffled by the religion Christianity as they compare it to their Norse Gods. They also had some funny dialog/s when they first see the cross and relics even the monks they say are strange people.
Hm…what about absolutely new ideas for games? Why shouldn`t you to combine styles? For example, you can try to combine Vikings and futuristic style to make the story like in the future they appeared one more time after the Armagedon? And they will have mutation and abnormal level of aggression?) )
yes, maybe something like this, but an accent should be made on their superpower and supermind)) and there will be 2-3 great tribes which want to populate the planet after the mankins extinction to build there their empire. They will fight for their outlook because it is very different from the vision of other tribes
I like the Vikings Idea and a chance to explore the Norse mythology but it’s still nice to add something new without straying too far that it might affect the game in a bad way.