Webakaza’s origin story involves a transformation from human to demon, which was carried out by muzan, over a hundred years ago.
Before his transformation, akaza.
Webakaza fatally wounding the flame hashira, kyojuro rengoku.
Webinitially introduced as a fairly evil character, akaza's backstory in the infinity castle arc reveals a different side to his character.
Akaza's life before becoming a demon, known.