In the TV series "The Walking Dead," Michonne, portrayed by actress Danai Gurira, wields a katana named "Katana" as her signature weapon. While the specifics of the character's maintenance routine are not explicitly shown in the series, it can be assumed that Michonne sharpens her katana as needed.

A katana, like any bladed weapon, requires regular maintenance to ensure its effectiveness and cutting ability. Sharpening the blade helps maintain its edge, making it more efficient in combat situations. Given Michonne's skills and knowledge as a seasoned survivor, it is reasonable to assume that she would understand the importance of sharpening her katana and keeping it in optimal condition.

Although the sharpening process is not explicitly depicted in the show, it can be inferred that Michonne takes proper care of her weapon to ensure its functionality and her ability to protect herself and others from the threats in the post-apocalyptic world of "The Walking Dead."