Millie Parfait is a virtual YouTuber and a member of Nijisanji EN's third wave, Ethyria. She is often portrayed as a cheerful and magical witch with a playful demeanor. Millie is known for her energetic personality and engaging live streams, where she interacts with fans through various activities such as singing, gaming, and chatting. As a part of Ethyria, she collaborates with her wave-mates to create entertaining content and build a vibrant community. Her quirky charm and magical theme make her a standout character in the Nijisanji universe.