Mary Jackson is the eldest daughter of the Jackson family, as well as the older sibling of Jake Jackson and her two young sisters. A devoted Christian, albeit in appearance, she follows everything her domineering parents tell her to do. Until the day three Ice Elementals broke off, each going to the sisters, transforming them into Ice Elementals. However, Mary’s newfound freedom and power took a dark turn due to her parents’ verbal abuse and strictness, hardening her heart and making her the first Elemental enemy of the Avatar Team. Now she is obsessed with turning the world into her winter wonderland, with her siblings at her side to rule.