Dracule Mihawk

Haki

One of the Seven Warlords of the Sea and the world's greatest swordsman.

With "Yoru" one of the 12 great swords, strapped to his back, he hunts pirates on his own.

He as once rivals with Shanks, but lost interest when he lost his left arm.

To gain the power to protect his friends in the New World, he trained Zoro in the sword arts for 2 years.