Yes, Zenitsu Agatsuma from the anime/manga series “Demon Slayer” does possess the Demon Slayer Mark. He gained this mark during his battle against the Upper Moon Six, Gyokko, in the Swordsmith Village Arc. The mark appears on his forehead and grants him enhanced physical abilities and agility, as well as heightened senses and increased resistance to demon attacks. However, like other Demon Slayer Marks, it also puts a strain on his body and can cause him to lose control if used for too long.
However, Zenitsu Agatsuma does not have a Demon Slayer Mark. In the anime/manga series “Demon Slayer,” only a select few Demon Slayers possess the Demon Slayer Mark, and Zenitsu is not one of them. Zenitsu’s unique ability is his Thunder Breathing technique, which allows him to move and attack at incredible speeds.