Yaya is a main character in the anime series 'Machine-Doll wa Kizutsukanai.' She is an autonomous puppet, known as an Automaton, crafted by the protagonist, Raishin Akabane. Despite her mechanical nature, Yaya exhibits human-like emotions and is deeply devoted to Raishin, often displaying a strong attachment and jealousy when he interacts with other females. Her combat abilities are formidable, as she is powered by a magical circuit called a 'Karakuri,' making her a crucial ally in battles. Yaya's playful yet protective demeanor adds both humor and tension to the storyline.