Tama Hieda is the youngest sister of the Hieda family, residing at and helping maintain the Asagiri Shrine with her older sisters, Kurako and Yuzu. As a priestess-in-training, she diligently performs shrine duties and participates in spiritual activities under her family's guidance. Her black hair and black eyes reflect her Japanese heritage.

Despite her youth, Tama possesses a playful and teasing personality, often directing this lighthearted mockery towards her sister Yuzu concerning Yuzu's romantic feelings for their cousin, Tadahiro Amatsu. This behavior stems from her observant nature regarding family dynamics, yet she maintains a core of kindness and affection for her sisters. Her father, Naonori Hieda, faces challenges in being heard within the family.

In spiritual conflicts, Tama wields ceremonial hand chimes as her talismans, though her combat role receives less focus than others. Her training centers on developing her abilities as a shrine maiden, adhering to her family's traditions. The Hieda sisters share edible-themed names inspired by regional candy flavorings, with "Tama" referencing one such traditional ingredient.