- ―Roshan giving an alien peace sign to a frozen UFO.[src]
Roshan was the son of a human tribe leader. While sleeping one morning, his tribe was attacked by a pack of saber-toothed tigers. The leader of the pack, Soto, wanted Roshan as revenge for Roshan's father, Runar, who killed half the pack and used their skin as clothing and their meat as food. Roshan's mother, Nadia, was able to fend off Diego, whose mission was to retrieve him. However, she was cornered over a waterfall, and in a desperate attempt to save her son, she leapt over the waterfall, holding Roshan tightly in her arms. 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.
Roshan's prime care-giver 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.
Roshan has a friendly and inquisitive personality.
Because of his friendly playful nature he bonded with each member of the "weirdest herd".
With Sid the two immediately bonded, with Sid being the somewhat main caretaker.
With Manny, it was different in that Manny was reluctant in having anything to do with the baby but eventually softens up to Roshan.
Roshan's relationship with Diego was much darker, because Diego had been sent to bring Roshan to Soto to be killed. Over time, Diego came to care for Roshan, eventually turning on Soto to save him.