Being an infant, Mosi is small and slight, with skinny limbs and a stumpy tail. Since he is not fully grown yet, he has no mane or goatee. His fur is dark gray while his ears, feet, hands, and muzzle are sandy-brown in color. He has dark, almost black fur on his wrists and ankles, and his eyes are black.
Mosi is often scared and timid, relying heavily on his mother.
Mosi is a baboon who lived during the reign of Jelani.
Mosi is first seen being cared for by his mother, Dalila. When Rafiki arrives, demanding to see Jelani, Mosi clings to his mother's stomach as she shows Rafiki to their lazy leader.
Much later, when the baboons of Jelani's troop are on a journey to find a new home, Mosi is abducted by a leopard. Being reminded of his own son back home in the Pride Lands, Simba races to Mosi's rescue and returns him to a distressed Dalila.