Dark Leopard used a stone mech-suit that is similiar to his grandson's and his great-great grandson's mech-suit. It has an Aztec theme, with the gold color and the feline characteristics.
At one time, Dark Leopard betrayed his Aztec people and married a Spanish woman (with whom he'd later father Golden Leon, who would become the first Rivera hero), thus becoming the first supervillain of the Rivera family.
As mentioned by Jorge Gutierrez, Dark Leopard is slightly inspired by La Malinche, a Nahua woman who played an active and powerful role in the Spanish conquest of Mexico, acting as interpreter, advisor and intermediary for Hernán Cortés. She was also a mistress to Cortés and gave birth to his first son, who is considered one of the first Mestizos.