Fan nicknames in Demon Slayer: Kimetsu no Yaiba.
- The main character group is collectively called the Kamaboko group by Japanese fans though this mostly applied to the trio of Tanjiro, Zenitsu, and Inosuke. This was at first inspired by Inosuke's Accidental Misnaming of Tanjiro (as "Gonpachiro Kamaboko") and went from there.
- "Michael Jackson", "Muzan Jackson", or even "The Hee-Hee Man" for Big Bad Muzan Kibutsuji, because his design resembles Michael Jackson
from his Smooth Criminal video a lot.- Japanese fans prefer to use "Michael Muzan."
- "Muzanna" for Muzan's female guise, given mainly by Indonesian fans since his chilling gaze in the guise resembles that of the horror film star Suzzanna.
- Himejima is referred to as "Godjima" because of his huge stature, unwavering kindness, and the fact that he's the strongest of the Pillars. Being voiced by fandom-favorite Tomokazu Sugita likely helps too.
- The Japanese fandom has given Muzan several nicknames, including:
- "Crossdressing Boy Man" (女装ショタおじさん, Josō Shota Ojisan), due to his shapeshifting abilities.
- "Honorary Demon Slayer" (名誉鬼殺隊員, Meiyo Kisatsutaiin), "Demon/Power Harassment Hashira" (鬼柱/パワハラ柱, Oni/Pawahara Bashira), "Power Harassment Breathing user" (パワハラの呼吸の使い手, Pawahara no Kokyū no tsukaite), and so on, due to his fatally Bad Boss tendencies towards his own demons.
- "Flashy Muzan" (チャラ無惨, Chara Muzan) for his appearance in the flashback of Chapter 178, where he is seen wearing a patterned yukata with a Cleavage Window.
- "Diced Steak Senpai" (サイコロステーキ先輩 Saikoro Sutēki Senpai) for the ambitious Demon Slayer who quickly gets killed by Rui.
- The Anime itself, especially the Infinity Train movie, is sometimes referred to in Japanese discussion board as the "Economy Pillar" as the box office revenue of the movie alone helped off-set whatever losses the Japanese movie industry took from the COVID-19 Pandemic; not to mention merch sales and other tie-ins that have sold really well.
- Sumi, Kiyo, and Naho are called the "Butterfly Sisters" or "Butterfly Triplets" due to all of them looking very similar and rarely being seen apart. This is despite them not being related at all. Another nickname for them is "the Caterpillars," since they are the youngest girls at the Butterfly Estate.
- Kyojuro is called a "donut" because of the gaping hole in his stomach after Akaza punched him.
- On another note, for some reason Kyojuro Rengoku is mostly a Last-Name Basis character in the Western Fandom, with very few referring to him as "Kyojuro" over "Rengoku".
