King Halo is a fictional horse girl from Uma Musume: Pretty Derby, known for her proud, elegant personality and strong sense of self-worth. She is a member of the series' cast of aspiring racers at Tracen Academy, where she competes in turf races while dealing with personal pride, pressure, and the desire to prove herself. Her role in the series is that of a determined rival and occasionally comedic aristocratic figure, adding both competitive energy and character-driven drama to the story.