Nux would do it.
He has achieved Mastered level Mastery and his Devouring Mist now had the power to Devour Life.
What more could he possibly achieve?
Even killing Emperors wasn't a big deal for the current Nux.
However, Nux realized this a while ago.
This wasn't the Mist's final form.
The System still showed a (+) sign before his Physique.
What did that mean?
It meant that even though he had 'Mastered' his Physique, he still haven't reached the end.
He dared to click on that (+) button when he was free, he wasn't doing very well on the Blank Points right now, and honestly, even if he was doing well, it wouldn't have done anything.
[Blank Points Required: 1,000,000]
Yes.
1 million Blank Points.
That was the amount Nux needed to upgrade his Physique.
1 fucking million.
Even if he multiplied the total number of Blank Points he had earned till now by multiple folds, he still wouldn't reach close to that number.