Oingo is a fictional character from the anime and manga series "JoJo's Bizarre Adventure," specifically appearing in the "Stardust Crusaders" arc. He is part of a duo with his younger brother Boingo, and together they work as assassins for the main antagonist, DIO. Oingo possesses a Stand called Khnum, which allows him to alter his facial features and assume the appearance of others. He is primarily involved in comedic and failed assassination attempts against the series' protagonists, adding a humorous twist to the otherwise intense storyline.