Runa Hirano anchors the left defence position for the Dream Monkeys ice hockey team. She belongs to the team's "Senior Set," a group distinct from the main rookie characters central to the series. Her appearance features brown hair, typically pulled back in a ponytail reaching her chest, blue eyes, and a height of 164 cm. She is frequently shown wearing a tracksuit. Her birthday is September 30, placing her under the Libra zodiac sign. As a senior member of the Dream Monkeys, she functions within the team hierarchy under coach Yōko Matsunaga alongside other established players. Within the series, the senior players act as supportive teammates aiding the younger members, though their overall on-screen presence remains limited.