Kono Dio da is a catchphrase spoken by Dio Brando, the main antagonist of JoJo's Bizarre Adventure, a long-running manga and anime series created by Hirohiko Araki. The line, which translates roughly as 'It is I, Dio,' became famous through Dio's dramatic introductions in the series, particularly in Phantom Blood and Stardust Crusaders. Fans clipped and remixed the moment across YouTube, TikTok and meme edits, turning it into shorthand for arrogant confidence and a sudden villain reveal. Its theatrical delivery keeps it popular in anime edits and reaction videos today.