In the show Ragnarok, what dialect(s) do they speak? It seems like some people use nynorsk's kvem etc and some people use Bergensk "r". What do most people, or the main characters speak?

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The show apparently takes place in a fictional town in Western Norway. So, most of the characters will have Western accents (but not Bergen ones) I'm assuming, though the actors come from all over. I imagine some of the actors are Westerners speaking their natural accents, some are from elsewhere putting on an appropriate (probably rural) Western accent, and some playing outsiders with their Eastern, Northern etc. dialects.

Nynorsk is a written standard only.

There is no specific Bergen R sound. There are two primary R sounds in Norwegian; "scarred" R of the West and South and the "rolled" R, found everywhere else.