Royo is mostly known for his starring role on the HBO crime-drama series The Wire as the drug addict and confidential informant Reginald "Bubbles" Cousins, a regular character since the show's first season.
Royo's prominent role in the HBO crime drama series The Wire as the character of Reginald "Bubbles" Cousins, a drug addict and informant, is what makes him well known.