I always found the characters of Asterix & Obelix series fascinating. Most interesting was the kindly Obelix, the overweight warrior who happens to be the toughest of them all. The voice talent he's given here is pretty good.
In this rather quirky movie, the more interesting character is Abba, the daughter of the Viking king. She isn't an originial creation, but her sass, her tough-gal attitude, and her front-teeth gap makes her fun to watch. I also liked the dumb son of the villain. There's good humor sprinkled all the place.