This phrase refers to a specific type of fan-created content, often found within online creative communities. It combines a character named Android 21 from the Dragon Ball FighterZ video game with a convention known as a “male reader insert.” The latter involves stories where the reader is implicitly included as a character, typically a male protagonist, interacting with the established fictional world and its characters. This usually takes the form of fanfiction, where amateur authors write narratives utilizing existing intellectual property to create new stories.
The popularity of this content stems from several factors. Firstly, the pre-existing appeal of the established character and franchise draws in an audience familiar with the source material. Secondly, reader-insert narratives provide an avenue for audience participation and immersion. Readers can vicariously experience interactions with beloved characters and explore the fictional world through the lens of a personalized character. This fosters a sense of connection and engagement that is often absent in traditional forms of media. The availability and accessibility of online platforms also contribute to the proliferation of this type of content, allowing creators to easily share their work and connect with like-minded individuals.