Horizon Ariadust is a fictional character from the multimedia project Project Sekai: Colorful Stage!. She is a member of the virtual idol group Vivid BAD SQUAD and is known for her energetic personality and strong stage presence. Horizon is characterized by her vibrant hair and stylish outfits, which reflect her lively nature. In the Project Sekai universe, Horizon Ariadust represents themes of friendship and self-expression through music. She engages with fans and other characters, showcasing her passion for performing and connecting with others. Her storylines often explore the challenges and triumphs of being an idol in a competitive environment.