John Raymond Rivera, better known by his ring name Rocky Romero, is a Cuban-American professional wrestler currently signed to New Japan Pro-Wrestling (NJPW) and All Elite Wrestling (AEW), where is a Vice President in both promotions. He is a member of Chaos. He also makes appearances for Consejo Mundial de Lucha Libre (CMLL), and Major League Wrestling. Also known by his nickname "Azúcar ", he is best known for his accomplishments as a tag team wrestler. He was member of tag teams like The Havana Pitbulls/Los Cubanitos, Forever Hooligans, and Roppongi Vice. His tenure as the fourth incarnation of Black Tiger was also met with praise and recognition.

Chaos is a professional wrestling stable, primarily performing in the New Japan Pro-Wrestling (NJPW) promotion and All Elite Wrestling (AEW). The group was formed in 2009, when nearly all the members of the Great Bash Heel (G.B.H) stable turned on leader Togi Makabe and reformed under new leader Shinsuke Nakamura. Soon after, the new group was named Chaos, with Nakamura as the leader. As the leader of Chaos, Nakamura was one of NJPW's top wrestlers, winning the IWGP Heavyweight Championship and the IWGP Intercontinental Championship as well as the 2011 G1 Climax and the 2014 New Japan Cup.