One of the most fun things about having worked on DC's MMO was the insane design-range the game had.... one day we'd be designing high-tech vehicles, the next we'd be doing your classic spandexed SuperHero, the next lo-tech prison guards, the next Barbarians and Vikings... you get the idea!
To all young designers out there, I highly HIGHLY recommend you do your homework and research before you jump head-on into a design... creativity is only as good as the 'facts' you are building it on. Let your 'Muse' fly as crazy as you want, BUT try and always have a solid 'starting point', after that, it's all GRAVY!!!
In the case of these two bastards... what informs my choices? needless to say that there's a HEALTHY doze of B.S. on both of them, BUT first I researched what kind of armor and what 'era-limitations' these kinds of warriors had... take the Barbarian dude for example: most pre-Roman armor HAD to be done in small segments (instead of big solid pieces) out of necessity... the metal was too crappy and brittle to allow for bigger pieces to be hammered into bigger shapes.. it wasn't until much later that 'Smithies' got better at making alloys that were stronger, lighter, and more flexible.... the Vikings weren't that much different... and although they came post Roman-empire, much of the Roman-technology had been lost during the Dark Ages... so again, for the most part, they dealt with 'segmented armor' out of necessity.
So go nuts in your designs, BUT make sure you add some 'believability' in 'em!
p.s. and yes, I do realize that that vikings never wore wings or horns on their helmets, BUT it looks cool!!!