Mirror of Whispers is a character in Radical Dreamers: Nusumenai Hōseki. As a living spirit from the Realm of the Looking Glass, she occupies the many mirrors of Viper Manor and transports between them at will, spying on the Manor's inhabitants and acquiring intelligence for Lynx. She is not the spirit of a dead human, rather, she is a creature from an alternate dimension whose origin is unknown and whose age is seemingly indeterminate but very old.