God Slayer Bowser

Spreading from a joke posted on January 21, 2021, a word-of-mouth rumor claimed that the Fury Bowser form in Super Mario 3D World + Bowser's Fury was named "God Slayer Bowser" in Japan. However, the game's Japanese website confirmed the name to be フューリークッパ Fury Kuppa like in English, with Kuppa being Bowser's Japanese name. Several game journalism sites put out articles debunking the rumor during its spread.

The official Japanese website does also write the name nonstandardly with 巨大 kyodai, so as to render フューリークッパ　ｖｓ．　ギガネコマリオ, "Fury Bowser vs. Giga Cat Mario", with the spelling of 巨大クッパ　ｖｓ．　巨大ネコマリオ, "Gigantic Bowser vs. Gigantic Cat Mario". This still carries no apparent connotation of gods or slaughter.

A related misconception that appeared in tandem was that the form's English name was "Mega Fury Bowser". This was similarly disconfirmed.