Mrs. Larson is the mother of Gustav Larson. She first appears in Gem of a Different Color, where she would be willing to give Fishlegs her 'first born, Gustav, later actually giving him to Snotlout in exchange for a Stone of Good Fortune. Of course, she seems to regret her actions later on in the episode, when the Changewings attack. It is clear that she seems worried about her son's life and will do anything to protect him.
- Mrs. Larson is the only named Viking mother in the whole television series.