Riku Harada is a fictional character from the popular Japanese multimedia franchise Project Sekai: Colorful Stage! feat. Hatsune Miku. He is a member of the virtual idol group Vivid Bad Squad, known for his energetic personality and passion for music. Riku is characterized by his bright blue hair and distinctive fashion sense, which reflects his vibrant and youthful spirit. In the storyline, Riku strives to become a top performer and often faces challenges that test his determination and teamwork skills. His interactions with other characters, including fellow group members and rivals, highlight themes of friendship and perseverance in the competitive world of idol culture.