Well we do have our share of badass murderous Viking in OTL. Like Bjorn Ironside, Erik the Red, Erik the Red's daughter, Ragnar Lodbrok, Ivar the Boneless, Erik the Bloodaxe, Sweyn Forkbeard, Gardar Svavarsson, Rurik of Holmgardr, Haraldr Fairhair, Hrolfr aka Rollo of Normandy, and of course Egil Skallagrimsson...