After Mutikapa the tiger goddess who lived in the forest surrounding the village is killed Aruruu finds her cub and raises it as her own naming it Mukkuru. He becomes Aruruus best friend and never leaves her side even being her riding mount in battle. After Aruruu begins raising Mukuru he begins growing very fast reaching adult size in only a few weeks. Mukuru is always hungry and eats a lot though Aruruus motherly guidance keeps him from overeating. Even after growing up Mukuru always maintains the mentality of a cub acting like a oversized kitten than a ferocious tiger unless in battle. Like his birth mother Mutikapa Mukuru has a hide that is impenetrable to any weapon even the AvuKamuu. Source: Wikipedia