Justice Jaguar (Real Name: Simon Rivera) is a Rivera superhero. The son of Mighty Cheetar, Manny's great-grandfather, Rodolfo's grandfather, Puma Loco's father who seemed to have been around during the Wild West times. He, like his grandson appears to draw his power from Golden Leon's bronze boots of truth.
He wears a sombrero and eye mask. A bullet belt hangs across his jacket. He has gloves like White Pantera and Golden Leon. He rides a black horse; probably the only Rivera that ever rode an animal as a superhero.
It is possible he might have been a sheriff during his time, due to his outfit (and badge), though it is still debatable. According to the creator, Jorge Gutiérrez, Justice Jaguar was the most antiheroic of all Rivera superheroes.
As mentioned by him, he died attempting to perform the Rivera Super Macho Blitz.
Puma Loco is Justice Jaguar's son. It is shown that the two never bonded well with each other as Puma Loco chose the path of evil. Despite his past differences with his son, they both still miss each other, as seen during their reunion in The Grave Escape.