Yes, I agree what you say about Cera and Littlefoot.
However, I think I can find a stronger bond of friendship in LBT. It’s actually Littlefoot & Chomper.
Considering what happened to Littlefoot’s mother in the first movie, most of the dinosaurs in the world would NOT have come back for Chomper like Littlefoot did and tried to help him in the 2nd movie.
