Aya's Doll is a minor character in the game who, as the name suggests, is a doll owned by Aya Drevis.

From what little is shown, Aya's Doll is portrayed as a rather wise individual. Though she tries to get her owner to leave Alfred to his fate (after Aya learns and witnesses the many atrocities he committed), and even attempts to convince Robin to journey with Aya and Maria, she never tries to push them into following her suggestions. This implies she wants others to make their own decisions, regardless of how good or bad they are.

Despite her being one of Alfred's test subjects, she doesn't assist the others in seeking revenge against him, though she's certainly not against the mad doctor getting his just desserts.