My reply's going to be short again, so unfortunately, I snipped your post for the second (and last) time.
I loved the part about Feudal Japan. I just wanted to throw that in there before I forgot. And the comparisons between the four groups of Angels, Demons, Spartans, and Athenians.
I fully agree that Dante is more Demonic in outer nature, but deep down has an Angelic heart that allows him to have an uncorrupted moral compass.
Vergil, like you said, is crisp, clean, and professional in nature (as demonstrated by his Iaido style and Summoned Swords). However, underneath that veneer of Anglicism, lies a corrupt Demonic heart, willing to compromise his morals in order to complete his goals.
Like I said before, it's like Unbreakable. It's got a good guy who's not completely good (David Dunn) and a bad guy who's not completely evil (Elijah Price).
For another example, here's what Joker would look like if he were good (his name in this reality is, coincidentally, Jester -- awesome). Jester was actually the mind behind the resistance. It shows how the Joker could have used his evil genius for good.
Here's Batman vs. Owlman, for further analysis:
The same can be said for humans themselves, can it not? The more willing you are to get your hands dirty and do manual labor yourself, the more likely you are to be humble and good-natured.
However, the more willing you are to tell others to do the work for you, while working in an office, away from the sweat, grit, and grime, the more likely you are to be corrupt and and willing to look down and betray your subordinates while you get a bonus just for running your company into the ground (obvious 2008 economic crisis and recent THQ Dissolution reference).
''No. Never 'good'. I am only human, after all.''
-Owlman
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''We both looked into the abyss. However, the difference between me and you is, you blinked.''
-Batman-
Yeah, I'm bitter.
So what?
-Downfall-