Demon Slayer: Kimetsu no Yaiba really impressed fans in the second season as Nezuko Kamado unleashed a ... that brought her demon powers to a scary new level. It’s this full demon transformation ...

As it stands, the anime adaptation has yet to focus on any Halloween shenanigans for Tanjiro, Nezuko, Inosuke, and Zenitsu, though the series has had plenty of scary moments throughout its history.