Professional imitators incorporate in their speech lexical expressions and gramatical markers used by the speakers they imitate. They also change their voices and body movements to make them more similar to the imitated speakers and enable listeners to identify them. Voice quality and facial expressions are central aspects in speech imitation due to their indexical role. The objective of this paper is to investigate the changes in vocal quality and facial expressions introduced by a professional imitator to imitate public figures. The corpus comprises video excerpts of speech samples from a professional communicator and the public figures he imitates. The research methodology comprises: perceptual analysis of the vocal quality settings and prosodic features by means of the VPA systtem; automatic extraction of acoustic parameters with the Prosody Descriptor Extractor; automated analysis of the imitator and the imitated speakers‘facial expression Action Unities, and multivariate statistical analysis. Results show the changes in voice quality settings and Actions Unities introduced by the imitator to make his voice more similiar to that of the imitated speaker. The imitator´s mimic ability to make changes in his habitual voice quality and facial expression characteristics provides deictic input for listeners to identify the imitated speakers.