Miku Hakadoll, known as Hackadoll 3-gou (ハッカドール3号) in the series 'Hacka Doll', is the third and most energetic of the main Hacka Dolls. She is known for her tomboyish personality, boundless energy, and love for idol culture, especially dancing and singing. Despite her carefree and somewhat clumsy demeanor, Miku is loyal and supportive of her friends. In the series, she assists users by analyzing their preferences, bringing comic relief, and helping solve daily problems with her unique, enthusiastic approach.