@Johnny:
As an aside note, is Drake's axe actually possible to make and wield in real life? I've never seen a design like it before.
Make? Yeah, it's a weird design but I don't see anything that would impede it.
Would it be a good weapon? Maybe not.
Axes tend to gain "power" because of it's weight distribution. Maces also gain their strength that way, but they're not full of openings. I can't even begin to think how a 4-sided-axe weight distribution would work or how it could affect the air resistence of the swings.
Maybe the Ap forum can spam the Men at Arms youtube channel and beg for this to be their next project.
They build funtional (i.e. actually sharpend) fictional weapons, from anime and video games, and then they actually take them for a few swings and comment on how good or bad of a weapon it can actually be.