Pastel was born 550 years ago as one of the few lasting from his species. He talks in a more, older way that most modern people cannot really understand. In dragon age he is actually still considered a child dragon and should be treated as such, being he's about the size of a 2 month old Labrador puppy.
When spoken to, Pastel speaks in a more older tongue, but when translated to English, it comes out almost in riddles and intricate speech patterns. You would hear Pastel say something in dragon tongue, and have it translated like "fair water skipper basks in the toad smiths lagoon" when its suppose to be "The girl is taking a bath". or "I am not here" when he says "Goodbye". He could be compared to a malkavian vampire with his speech patterns despite not being clinically insane of course.