Bearing in mind that both have saved Luffy's life at some point or another…
C'mon, Ivankov has the balls to have a 24/7 party in hell, making a mockery of all that Impel Down stands for, and he's Bon-chan's hero! He is probably the ultimate engineer of the body, and even if Kureha has a body to be envied, I bet Emporio could have one too if he chose to :P. He's also an important figure in the Revolutionaries, and his ideologies that we've only briefly seen are really quite noble.
@Emporio:
**"Do not take the power of life so lightly! Do you have any idea what it takes to recover a life from certain doom?! I am no God, no Buddha! 'Miracle Worker'? You people may call me what you wish, but let me tell you this: not once have I saved the life of a fool who relies only on the help of others. Oh I have saved countries drowning in poverty, even countries defeated in battle and left in ruins…but all that I truly did was draw out their own will to live!"
"Miracles can only descend on those with the will to carry on! Do not take them so lightly!"**
Now if that isn't one of the most badass speeches ever given in OP, then I don't know what is.