Mystique, as a character, does not get too many lines in the original trilogy. To remedy this, we're going to adapt some of the dialogue in the Junior Novelization as well as the Graphic Novel Adaptations of all the movies.
What I'm looking for in Mystique is something very quiet, cold, and oddly sultry in tone but still very sinister in a way. Sort of like a wicked ASMRist in a way. (Thumbs up if you are actually an ASMRist auditioning for the role!) She rarely talks, so when she does, it immediately grabs one's attention.
It's undecided if I'll filter her voice as they do for Rebecca Romjin's voice; however, if your audition does include a voice filter or some type of voice mod, that is fine.
As with all these auditions, I don't mind if someone does their own interpretation of this character rather than trying to sound EXACTLY LIKE the movie version.
Voice References:
https://www.youtube.com/watch?v=tyIqQG-D0TM
https://youtu.be/35X7jCUFtKY?is=SDcO9s8pdR8h7xmr
https://youtu.be/_qjkwovZweI?is=xE58hIbeK67l2FD7