Keenan McCall
Fortunately, we’ve done the research and found the answers you’re looking for. Do be warned, though: There are Full Spoilers Ahead for the Katana Man arc and Minor Spoilers for the climax of the series.

Who Is the Katana Man in Chainsaw Man? Answered

Put simply, Katana Man is an unnamed person who has entered the same type of contract that Denji entered into with Pochita to become Chainsaw Man. This allows him to manifest the same sort of Devil transformation, except he sprouts katanas from his body instead of chainsaws. The reason Katana Man made this contract is directly tied to Denji. He is the grandson of the Yakuza boss Denji had to kill at the beginning of the series, and swore revenge after he discovered that Denji was responsible for his family member’s death. It’s for this reason that he agreed to join forces with Akane, who was instructed by the Gun Devil to retrieve Denji’s heart in exchange for unfathomable power. Through his partnership with Akane, Katana Man came into contact with the Katana Devil and made a contract with it: In exchange for the Katana Devil becoming his heart and allowing him to manifest its power, he would eliminate the Chainsaw Devil by giving it to the Gun Devil to be devoured. This was presumably favorable to the Katana Devil, though it’s never confirmed exactly why. It can be assumed, however, that it was because the Katana Devil feared being devoured by the Chainsaw Devil, as this would mean it would be erased from humanity’s memory and kept from reincarnating unless it was cut out of the Chainsaw Devil’s stomach.

Does Chainsaw Man Beat the Katana Devil?

Unfortunately for Katana Man, Denji does eventually defeat him in Chainsaw Man. This happens near the conclusion of the Katana Man arc, wherein Denji, Aki, and the rest of Division 4’s surviving members stage a counterattack against Katana Man, Akane, and their forces. This results in Katana Man’s defeat and capture, as well as the stamping out of Akane and her minions for good at the hands of Makima and her subordinates. Hopefully this cleared up who Katana Man is in Chainsaw Man. For more on the series, we’ve got explainer guides on topics like whether or not Denji fights the Gun Devil, whether or not Himeno and Aki get together, and what the gold ball in the opening is. We’ve also got plenty of other articles related to the series, which you can view down below.

Why Couldn’t Asa Turn Denji Into a Weapon in Chainsaw Man? Explained Release Date & Spoilers for Chainsaw Man Chapter 119 Release Date & Spoilers for Chainsaw Man Chapter 118 Ranking Chainsaw Man Season 1’s EDs: Violence, Death, & Plenty of Power Does Kobeni’s Family Show Up in Chainsaw Man? Answered
Who Is Katana Man in Chainsaw Man  Explained - 3