No, Katniss is the official Mockingjay, Rue inspired the revolution, but Prim started it. If Prim hadn't gotten picked Katniss wouldn't have volunteered then she wouldnt have met Rue who sparked the Mockingjay.
Sun Bak from I love each of the eight main characters for different reasons, but Sun has to be one of my ultimate favorites. I just love how composed, sacrificing, strong, and bad ass she is. This character quote does her great justice.