Panthera

Panthera (voiced by Cree Summer) - Exclusive to the 2011 series, Panthera was a Thunderian based on a panther who was among the Thunderians that worked for Mumm-Ra. Being the voice of reason to Leo, she tried to convince him that Mumm-Ra's methods of destruction do not match his goals. It was not until the death of the Plun-Darr galaxy that Panthera aids Leo in planning a resistance against Mumm-Ra. Her fate after the Black Pyramid's descent to Third Earth is unknown (although, given that she and Leo were implied to be a couple, it's possible that she married him and is also Lion-O's ancestor).