Acting or just being himself?
About a quarter of the way in to Warcraft, Travis Fimmel morphed from being Brad Pitt into being Ragnar Lothbrok (of the smug smile, sly sideways glances and whispered semi-threats). After that it was all Vikings vs. Orcs to me.
So, is that Ragnar characterization an invention of the actor (which would be interesting), or is it just an aspect of the actor's personality and will be showing up in all future roles (which is going to make everything look like Vikings).