Chiikawa "Something that imitates and rolls round and round (rabbit)" It reacts when put together with Chiikawa/Hachiware!
Joy Palette will sell a Chii-Kawa "Nankan mimic buruburu mawaru yatte (rabbit)". When spoken to, it records sounds for a maximum of about 6 seconds and spins around while parroting back in a slightly high-pitched voice.
