This phrase represents a specific type of fan-created content. It denotes a fictional scenario where a character named Android 21 from the Dragon Ball FighterZ video game is romantically or sexually involved with a character who is imagined to be the reader of the fan-created work. This category falls under the umbrella of “reader-insert” fan fiction and art.
The popularity of such content stems from a desire for personal connection and immersion within a fictional universe. Individuals engaging with this genre often seek escapism and wish fulfillment by envisioning themselves as integral to a narrative featuring beloved characters. The “x male reader” element provides an avenue for this self-insertion, while the inclusion of Android 21 offers a specific character focus that may appeal to fans of that character or the Dragon Ball franchise.