Pedro Aguayo Ramírez was a Mexican professional wrestler and promoter who achieved fame in wrestling as Perro Aguayo Jr. or El Hijo del Perro Aguayo. He was the real-life son of lucha libre legend Perro Aguayo and not a storyline "Junior". Aguayo was best known as the leader of the Los Perros del Mal stable, which he started in Consejo Mundial de Lucha Libre (CMLL) in mid-2004. The stable became a significant draw in Mexican professional wrestling, peaking during Aguayo's storyline rivalries with Místico and Héctor Garza. In October 2008, Aguayo left CMLL to start his own independent professional wrestling promotion Perros del Mal Producciones, built around members of his Los Perros del Mal stable. In June 2010, Aguayo returned to AAA after a seven-year absence to start an invasion storyline involving his stable.

Blue Demon Jr. is a Mexican professional wrestler. He is the adopted son of the original Blue Demon and is the first Mexican and second masked wrestler to win the NWA World Heavyweight Championship thus making him a one-time world champion. His real name is unknown to the public, as is often the case with masked wrestlers in Mexico, where their private lives are kept secret from fans.