Hello, and welcome to GOF!
Personally, I'm not fond of potty humor.
Oh and Ruby is a TV series only character. She is a fastrunner (oviraptor) who was put in charge of Chomper by his parents, and she and Chomper went to live in the valley to learn how the herds work together so they could one day defeat Redclaw, a scarred tyrannosaurus.
At least, that's what I remember. The TV series didn't really focus too much on that plotpoint.