One Piece Who Can Use Haki. And Enel could spy on people because of his devil fruit. As of chapter 1011 Big Mom was shown using Advanced Conquerors Haki against Page One and even before the confirmation of Advanced.
Not just anybody can have Conquerors Haki in One Piece but there are some hints that Sanji could possess that power. It is also possible to maintain and use Haki while unconscious as seen when Newgate used Kenbunshoku Haki in his sleep to defend himself from Ace. But with One Piece chapter 1010 we all know that thats exactly what Oda is trying to convey us indirectly.
Though they act independently most of the time there are times where the lines between the two power systems blurOnePiece2021top10onepiecetop10anime.
While Sanji is never going to. Not just anybody can have Conquerors Haki in One Piece but there are some hints that Sanji could possess that power. One Piece stylized in all caps is a Japanese manga series written and illustrated by Eiichiro OdaIt has been serialized in Shueishas shōnen manga magazine Weekly Shōnen Jump since July 1997 with its individual chapters compiled into 101 tankōbon volumes as of December 2021The story follows the adventures of Monkey D. Fishmen can breathe under water and supposedly the weakest Fishman is 10x stronger than an average human.