One-Punch Man introduces a wide range of lovable, weird, or just plain awkward characters to its continuously growing superhero roster. This includes characters far beyond simply Saitama, with quirky characters like King or Mumen Rider being fan favorites in their respective rights. However, as the series proceeds, certain heroes undergo rebranding to change their images. Isamu, known as Child Emperor in One-Punch Man, changed his name in recent chapters for a hilarious reason, and his colleagues are still trying to adjust over a dozen chapters later.

https://screenrant.com/one-punch-man-child-emperor-name-change-virgin/