Rumi Cookie is a Special Cookie released in the KPop Demon Hunters x Cookie Run: Kingdom collaboration update (v.7.3) alongside Mira Cookie and Zoey Cookie. She is of the Ambush type, and her position is prioritized to the Front. She is the lead vocalist of K-pop girl group HUNTR/X.

== Appearance ==

Rumi Cookie has a fair dough complexion, purple eyes (unlike the brown eyes she has in her original appearance), and long, brilliant purple hair, typically styled in a thick dragon tail braid that reaches down to her calves. Though her skin is normally pale, she also inherits purple demon patterns that glow pink whenever she is under stress. In such moments, her irises also shift from brown to gold, and her hands become clawed. Overall, Rumi has a striking appearance that could be described as a Korean "classic beauty."

Her outfit consists of a bright yellow cropped bomber jacket with black accents on the collar, cuffs, zipper line, and pockets. The jacket features bold graphic details, colorful patterns, and several patches, with black, spiked padding on her left shoulder. Underneath, she wears a white mockneck crop top with two necklaces. She pairs it with high-waisted dark indigo denim shorts, a pink belt with a norigae attached, and black calf-length platform boots with red stripes.

For weapons, she has a ceremonial Korean blade known as the Saingeom Sword, more specifically, its Phase 1 version; the blade is translucent, with a glowing blue hue engraved with bright constellations. It has a gold hilt with a simple crossguard, a grip wrapped in spiraling gold bands, and an ornate pommel with a purple gem.

For most of her screen time, Rumi deliberately chooses clothing that conceals the demon patterns on her body, particularly those on her arms and neck.

== Personality ==

On stage, Rumi Cookie is the dazzling heart of HUNTR/X, her voice capable of stirring tears and igniting passion in concert halls filled with thousands. Offstage, she transforms into a vigilant protector, using her demon-hunting skills to guard her fans and the people of Honmoon. Balancing fame and danger, Rumi carries the weight of leadership with grace, ensuring her group’s performances are flawless while keeping the darkness at bay.

Her singing is more than talent—it’s a weapon and a shield, an extension of her soul that channels both beauty and strength. A single swing of her Saingeom Sword can fell even the fiercest demon, yet her true motivations remain a mystery, hidden beneath her composed demeanor. Not even her bandmates know the full story behind the passion in her songs or the reasons she embraced the path of a demon hunter.

Rumi’s dual life shapes her into a figure of both inspiration and enigma: a pop star whose melodies can soothe hearts, and a warrior whose resolve strikes fear into darkness. Every note she sings, every step she takes, serves to protect Honmoon and unravel the secrets etched deep within her dough.

== Trivia ==

• Rumi Cookie's Korean voice actor, Shin Na-ri, also provides the voice of Sugar Glass Cookie.
• Rumi Cookie, alongside Mira Cookie and Zoey Cookie, are the first special collab Cookies to have a costume released with them.
• Rumi and Mira are close in age, both around 23–24, with Rumi being six months older. Zoey is the youngest among them, aged 22–23.
• Initial early film concepts depicted Rumi and Jinu as love interests, with scenes of them going on multiple solo dates, including a romantic aquarium outing where they kissed.
• Rumi’s official name is most likely Rumi Kang (강루미 Kang Rumi), not Rumi Ryu (류루미 Ryu Rumi)—the latter being a fan-assumed surname based on her mother’s confirmed name, Mi-yeong Ryu (류미영 Ryu Mi-yeong). This clarification comes from an illustration by an official Netflix artist responsible for background character designs, including the flight attendants and several demons.

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