Roronoa Zoro controlling his haki

Roronoa Zoro is a fictional character from the One Piece manga and anime series. Haki is a powerful ability that allows a person to exert their willpower over others and the environment around them. There are three types of Haki: Observation Haki, Armament Haki, and Conqueror's Haki.

Zoro has shown the ability to use both Armament Haki and Observation Haki. Armament Haki, also known as Busoshoku Haki, allows the user to harden their body and increase their attack power, as well as bypass certain types of defenses. Zoro has demonstrated this ability when he fought against Monet, a Logia type Devil Fruit user, and was able to cut through her intangible body.

Observation Haki, also known as Kenbunshoku Haki, allows the user to sense and predict their opponent's movements, as well as sense the presence of others. Zoro has demonstrated this ability when he was able to sense and dodge the attacks of the swordsman Killer, who had been possessed by a powerful pirate, and was also able to sense the presence of the giant Pica, who was hiding within the stone structure of Dressrosa