The Powerful System of One Piece: Diving into the Dark Side and Haki
While many characters in One Piece, such as Luffy and the Straw Hat Pirates, constantly harness the power of the dark side along with Haki, formidable swordsmen like Shanks and Mihawk focus significantly more on refining their unique forms of Haki.

In One Piece, Mihawk holds the title of the world’s greatest swordsman. However, the actual strength level of this enigmatic figure remains unclear.
In the One Piece manga, the intricate system of powers, information, and relationships of characters often makes it difficult to track them, which is why the Vivre Cards play such a crucial role as sources of information within the One Piece lore.

Currently, Mihawk’s Vivre Card does not contain any information about him using Haki, even though almost all of the strongest characters are known to possess this ability.
Fans have debated this issue, with some believing that important information may not be disclosed in Vivre Cards. Others argue that Mihawk does not belong to the ranks of the highest-level characters.
As one fan shared: “I suspect that Haki is not revealed for Mihawk until later. I seriously doubt that he could match up against Shanks if he didn’t possess it.”
In the past, Shanks and Mihawk have clashed many times, but it remains unclear who emerged victorious. Even a character like Roronoa Zoro, when speaking with Shanks in Chapter 434, hinted that the outcome of battles between Mihawk and Shanks still lingers in the air. This only adds to the notion that their confrontations are monumental, often leaving a deep impression on Zoro. If Mihawk lacked Haki, how could he even stand toe-to-toe with Shanks?
“The Vivre Cards of Zoro and Garp do not confirm the use of Haki, even though we know both characters have it. Mihawk’s situation could be similar.” wrote another user.
After the dissolution of the Seven Warlords, Mihawk’s bounty was revealed to be 3,590,000,000 Belly, surpassing Monkey D. Luffy by about 300 million Belly, further highlighting Mihawk’s immense power.
Now, to ascertain whether Mihawk possesses Haki or not, we have to wait for confirmation from the author, Oda.