Zenitsu Agatsuma, a character from the anime and manga series "Demon Slayer: Kimetsu no Yaiba," wields a sword known as a "Nichirin Blade" like other demon slayers. The Nichirin Blade is a special type of sword used by demon slayers to combat demons effectively.

The exact design and characteristics of Zenitsu's Nichirin Blade are not specified in the series, as each demon slayer's sword can have unique details and variations. However, like other Nichirin Blades, it is typically depicted as a katana-style sword with a straight blade and a curved guard (tsuba) in a variety of colors.

The color of Zenitsu's Nichirin Blade is unique to his character and plays a significant role in his abilities. Without spoiling too much, Zenitsu's blade has a distinct color associated with his lightning-based combat style.

It's important to note that the Nichirin Blades in "Demon Slayer: Kimetsu no Yaiba" are fictional weapons created for the series and do not exist in real life.