A young human baby, Roshan lived with his tribe during the days of the ice age and had seen very little of the world around him. Roshan was the son of a human tribe leader. During the events of his infancy, however, he saw and experienced much of the world, at the paws of three animals out to return him to his tribe, which he had been displaced from.
One evening, during the days in which the weather began to grow colder, Roshan and his family were at their village, with Runar, Roshan's father, teaching his young son to take his first steps with his wife Nadia. Unbeknownst to them or the rest of the tribe, they were being eyed by two tigers, Diego and the pack leader, Soto, that evening, who conspired to take Roshan's life in retribution for Runar's hunting and killing of half their pack, using the sabers' skins to make clothing.
The following morning, just before dawn, the saber pack had snuck into the camp to attack the humans, but were given away by the tribe's dogs, and the majority of the sabers were thus engaged in a battle with the tribe's hunters while Diego, Soto's trusted lieutenant, snuck into Runar's tent and found Roshan fast asleep. At that moment, Nadia struck at Diego and ran off with a sleeping Roshan in her arms, running from the campsite and through a river. Reaching the waterfall at the end of the river, Nadia found herself cornered by the saber and, holding her baby tightly, jumped over the falls, her son in her grip.
They were both found by Manny and Sid at the riverside, and using what little strength Nadia had left, she gave Roshan to Manfred and Sid in hopes that he would be safe with them. Sid suggested to return Roshan to his tribe. Reluctantly, the two accepted help from Diego, who offered to help track the humans to their settlement up north.
Personality and Traits
As a young baby, Roshan was impressionable and had seen very little of the world. He does have a compassionate heart, easily warming up to the herd and comforting Manny as he learns to move on from his tragic past.
Roshan's prime care is Sid, the only member of the group who initially has any interest in him, Manny being too cynical to care and Diego secretly planning to kill him. Manny, after his previous experience with humans, is reluctant to have anything to do with the baby, but eventually bonds with him. At the end of the movie, Roshan is reunited with his tribe. Runar is particularly happy to learn that the baby has learned to walk during his time with Manny, Sid, and Diego.
As Roshan's family, Runar and Nadia care deeply for their child. Both are shown to go into great lengths to either protect or even avenge him. When Nadia is forced to flee from the campsite, she entrusts Manny to take care of him. Believing his wife and son to be dead, Runar seeks revenge. When he is reunited with his son by Manny, Runar immediately changes his demeanor.
Manny was entrusted by Nadia to take care of her son. Despite this, he is reluctant to be associated with him. This is likely due to his past with the Neanderthals that hunted down his previous family. Soon enough, Manny warms up to him and calls him various nicknames and returns him to Runar.
Sid is Roshan's primary caregiver throughout the movie. He is shown carrying him, feeding him, and attempting to change his diaper. He is made upset by Manny’s refusal to do the same. While Sid does care for him, he will occasionally use Roshan for his own benefits. An example of this is when he uses Roshan to woo two fellow sloths at a mud bath.
As a member of Soto's pack, Diego's main goal throughout the movie is to kidnap and give Roshan to Soto. He is shown chasing after Nadia during their attack. As Roshan was asleep at this time and is an infant, he does not recognize Diego later. Diego soon changes his mind after befriending the trio and instead warns them of Soto.
For revenge for his fellow Saber-tooth tigers, Soto decides to hunt down and kill Roshan. He entrusts Diego with the task of kidnapping the baby which eventually backfires from Diego's betrayal.