Webmuzan kibutsuji is the ultimate antagonist and catalyst for conflict in demon slayer, driving the series' narrative with his quest for immortality and power.
Websun breathing fourth form is called burning bones, summer sun, where the user unleashes a large circular slash that defends from upcoming frontal attacks.
Webgyomei himejima's backstory adds depth to his character and the entire demon slayer anime by showing the monsters in humanity and blurring the line between good and evil.