Demon Slayer, Taisho Secrets, Kimetsu no Yaiba, Muzan, Demon Slayer Season 3, Tanjiro
The Upper Moon Demons in Kimetsu no Yaiba are vicious but they all have a sad backstory, and despite the fact that they've been changed, they still have secret hobbies that you never learn about in the series unless you buy the Demon Slayer Databooks which offer us a secret view at all sorts of characters from the Upper Moon Demons, to Muzan, and even the Pillars, or Hashira!
