"Simple oar"?!?!?! There is nothing simple about it. It might not have the sharp edge of an axe, but Charon puts enough force behind his swings that it might as well have.
Makes sense when you think about it. Zag was raised as royalty by a cadre of servants that could support his every need during a time of peace (for the gods at least). Mel was raised as a warrior by a band of rebels that often reminder of what was taken from her in a cataclysmic war that's lasted her whole life. It's understandable that one of them is more locked in than the other was.
Dont forget it wasnt just other gods of other pantheons but also heroes like Arthur, Gilgamesh and Beowulf. And even the fallen angel Lucifer! I hope to see an aspect of someone like Lilith or Sun Wukong