Poala serves as a central narrative figure, introduced as the protagonist’s childhood friend and adoptive sibling after her family shelters him following his separation from his brother. Driven by loyalty to her hometown and the need to fund her father’s medical treatments, she becomes a Buster specializing in combating supernatural threats. Initially focused on local defense, her ambitions expand when the protagonist’s return galvanizes her to join a wider mission to终结 a dark era. She adopts a strategic role, overseeing team finances, logistics, and meticulously documenting missions in her diary. Pragmatic and methodical, her approach frequently clashes with the protagonist’s impulsiveness, creating tension tempered by her unwavering loyalty to their shared cause.

Her combat expertise centers on fire-based Divine Power, wielding techniques like Fire Pole and Burst End—a close-range explosive strike. Early limitations in ranged combat honed her proficiency in point-blank engagements, culminating in her dismantling a major antagonist by obliterating its arm. During a critical battle against an undead foe, she acquires the Saiga "Blaze Gunarm," upgrading Burst End to detonate explosives internally within targets. Though secondary, she also commands water-based abilities like Hail Bullet and Hail Stone Cone. Her arsenal evolves from dual blades and an armored gun to reliance on her Saiga as her fire mastery intensifies. A near-fatal injury from a high-level antagonist highlights her offensive specialization and vulnerability due to minimal defensive skills.

Interpersonally, her bond with the protagonist is layered: he jokingly declares her his future spouse despite her protests, while she masks jealousy toward his admirers with indirect concern. Creators position her as representing ordinary individuals within the narrative’s extraordinary context, her name rooted in a French term for "chest," symbolizing a thematic emphasis on heart-centered emotional and experiential depth. Her arc traces a journey from community guardian to pivotal actor in a global struggle, reconciling personal stakes—her father’s health and hometown—with collective duty to reshape their world.