I would say Aizen. There are plenty of other well-written shonen villains but I don't think any of them carry their anime as much as Aizen carries Bleach. The quality takes a nosedive whenever he's not on the screen or involved with the plot somehow.
He also has so many great quotes:
"Admiration is the furthest state from understanding."
"Since the beginning, no one has ever stood in the heavens. Neither you, nor me, not even God himself. But that unbearable vacancy in the throne of Heaven shall be filled. From this day forth, I will stand in heaven."
"All creatures want to believe in something bigger than themselves. They cannot live without blind obedience. And to escape the pressure of that trust, those in whom faith is placed in turn look for someone higher than themselves. And then those people in turn look for someone even stronger. That is how all Kings are born. That is how all Gods are born."
"A victor must speak of how the world should be, not how it currently operates!"
Who do you think is the best?
He also has so many great quotes:
"Admiration is the furthest state from understanding."
"Since the beginning, no one has ever stood in the heavens. Neither you, nor me, not even God himself. But that unbearable vacancy in the throne of Heaven shall be filled. From this day forth, I will stand in heaven."
"All creatures want to believe in something bigger than themselves. They cannot live without blind obedience. And to escape the pressure of that trust, those in whom faith is placed in turn look for someone higher than themselves. And then those people in turn look for someone even stronger. That is how all Kings are born. That is how all Gods are born."
"A victor must speak of how the world should be, not how it currently operates!"
Who do you think is the best?
