Lioleia, also known as Rathian, is a significant and recurring monster in the Monster Hunter Stories anime series. As a majestic and powerful wyvern, Lioleia is renowned for her fierce loyalty and protective instincts, often serving as a key companion to the main characters. Her emerald-green scales and fiery breath make her a formidable presence in battle. Throughout the series, Lioleia's strength and bond with her Rider highlight the importance of trust and cooperation between humans and monsters.