King Halo is a prideful, resilient horse girl whose unwavering motto of perseverance drives her top-class, egotistical persona, relentlessly pursuing recognition. She boasts long brown hair, piercing crimson eyes, and distinctive blue ear covers adorned with a green bow and gold charms on her right ear. Her regal presence is accentuated by a green racing dress marked by black stripes and gold accents. Born to a first-rate horse girl and designer, her ambition stems from a daughter’s struggle to emerge from her mother’s shadow, fueling her resolve to prove her worth. Though haughty, she secretly mentors underclassmen like Kawakami Princess, instilling poise and refinement to shape them into dignified rivals. Her bond with roommate Haru Urara thrives on mutual tenacity, their camaraderie unshaken by racing setbacks. As a member of the 1998–1999 "Golden Generation" alongside rivals like Special Week and Seiun Sky, her fiery ambition clashes with Seiun’s carefree demeanor, sparking a rivalry of opposing ideals. Her journey mirrors her real-life counterpart’s storied perseverance: eleven grueling G1 attempts culminated in a triumphant 2000 Takamatsunomiya Kinen victory. Post-retirement, she champions resilience and legacy, guiding younger generations while her bloodline endures through protégés like Kawakami Princess. Her design honors her history, blending jockey silks, a shadow roll, and gold motifs to embody focus and indomitable spirit. She does not appear in *BNW no Chikai*, a narrative centered on the BNW trio.