Calahan Skogman's character, Matthias, has been upgraded to a regular for the new season, after the witch-hunter aided in Nina's capture last season. If you'll recall, though, things took a turn for the better between him and Nina, so we'll be very curious to see how their new relationship plays out in season two.
"Shadow and Bone" is Skogman's big break, which makes his season two status as a series regular instead of a recurring role that much more exciting.