Freezun, a humanoid entity sculpted from ice, boasts azure skin adorned with violet facial markings, spiked glacial growths on his right shoulder and left wrist, and hair resembling jagged light-blue crystals. Hailing from the Dotsuku Zone, he pledges allegiance to the Evil King, partnering with Frozen to declare themselves the "strongest combination." United by their loathing for warmth, they target the phoenix Hinata, whose life-force perpetuates heat across dimensions.

In their initial assault, Freezun and Frozen dispatch a Zakenna to seize Hinata before ambushing their foes in the Garden of Clouds. They encase the phoenix in a glacial prison, transforming the garden into a frozen wasteland. To dismantle their adversaries’ unity, they implant soul-chilling ice crystals into Cure Black and Cure White, forcing the allies into violent conflict—a tactic revealing their mastery in exploiting emotional fissures. Defeat unravels their camaraderie, as accusations replace coordination, laying bare their fractured alliance.

Their joint technique, "Freezing Blizzard," merges their arctic energies into tempests capable of flash-freezing entire ecosystems. Though initially vanquished, Black Hole resurrects them for a crossover confrontation, where they clash with Cure Melody and Cure Rhythm. The pair’s "Passionato Harmony" overwhelms the icy duo, sealing their fate once more.

Freezun’s repeated defeats underscore the inherent instability of his bond with Frozen, starkly contrasting the resilient unity of those who thwart them. His documented role culminates in these encounters, with no subsequent resurgences recorded.