- Acclaimed Flop: The French edition of the manga (titled "Les Rôdeurs de la nuit", or "The Night Prowlers") bombed spectacularly and was stopped after 3 volumes, due to the Invisible Advertising and Panini Manga's reputation as a notoriously incompetent publisher. After the anime's simulcast on the Wakanim platform met a huge success, it became clear that the manga's failure wasn't due to negative reception, and Panini announced they'd restart the series under its English international title, much to the dismay of early fans who liked the French title.
- All-Star Cast: It has multiple big names in the industry from the main characters even minor characters Natsuki Hanae Yoshitsugu Matsuoka, Hiro Shimono, Takahiro Sakurai, Yuki Kaji, Nobuhiko Okamoto, Ryohei Kimura, Hikaru Midorikawa, Jun Fukuyama, Yuko Minaguchi just to name a few.
- Fan Nickname: "Michael Jackson" or "Muzan Jackson" or even "Hee-Hee Man" for Big Bad Muzan because of his design resembling Michael Jackson from his Smooth Criminal video a lot .
- Relationship Voice Actor:
- Nezuko, Inosuke, Zenitsu and Giyuu are Siluca, Moreno, Selge and Villar
- Tanjiro, Zenitsu, Sabito and Giyuu are Kaneki, Naki, Ayato and Uta
- Zenitsu and Giyuu are Isidro and Griffith
- Nezuko and Sabito are Azel+Komatsu and Seth
- Inosuke, Tanjiro, Giyuu, Sabito, Kyogai Genya, and Makomo are Souma, Takumi, Isshiki, Kuga, Akira, Ryo and Mayumi
- Giyuu, Inosuke and Zenitsu are Mitsuhide, Magellan and Brutus
- Tanjiro, Sabito, Yushiro, and Giyuu are Haruichi Kominato, Mei Narumiya, Takuma Seto, and Kazuya Miyuki
- Kibutsuji, Giyuu, Urodaki, and Ubuyashiki, are Iruka, Sasori, Jiraiya, and Minato.
- Sabito, Giyuu, and Ubuyashiki are Koichi, Rohan, and Kira. Add Odo no Oni and Teoni and you've got Sonic, Zombieman, Boros, Gyoro-gyoro and Garou. And as a bonus, both Odo no Oni and Teoni had their fair share of being Dio.
- Sabito, Zenitsu, and Teoni are Eren, Connie, and the Beast Titan.
- Kibutsuji, Teoni, and Odo no Oni are Duo, Zechs, and Heero.
- Giyuu and Tamayo are Ayame and Akito Sohma.
- Yushiro, Sabito, Genya, Kyogai, Zenitsu and Odo no Oni are Izuku Midoriya/Deku, Shouto Todoroki, Katsuki Bakugou, Shouta Aizawa/Eraserhead, Dabi, and Best Jeanist.
- Yahaba, Giyuu, and Odo no Oni are Lelouch, Suzaku, and Xingke.
- Tanjiro, Yashamaru and Giyuu are Inaho, Inko, and Trilliam.
Trivia / Demon Slayer: Kimetsu no Yaiba