Various implementations disclosed herein include devices, systems, and methods for synthesizing virtual speech. In various implementations, a device includes a display, an audio sensor, a non-transitory memory and one or more processors coupled with the non-transitory memory. A computer-generated reality (CGR) representation of a fictional character is displayed in a CGR environment on the display. A speech input is received from a first person via the audio sensor. The speech input is modified based on one or more language characteristic values associated with the fictional character in order to generate CGR speech. The CGR speech is outputted in the CGR environment via the CGR representation of the fictional character.