There are 2 things that are common in AVH/VH (hearing voices), that are included in the leading phenomenological research. I believe that most maybe all people who live with the experience of hearing voices not only use the same factors in identifying voices, and knowing their personalities. These two things are:
1) the sound (sonic / audio) characteristics, the tone, of each voice
2) the changing location that the voice occupies in 3D Cartesian space - the spatial location and orientation.
Do you agree that the second one (2), the spatial orientation, can change while hearing the voice, and this can be very disconcerting. However, the first one (1) seems reliable, and voices can not and do not change their 'sound'.
There are other factors that I believe subjects rely on, like the gender of the voice, and the intonation and inflexion etc. But do you agree that it is always important to think you know the 'person' who owns that particular voice, because some are hateful, whilst some are more friendly?
I am also very interested to hear how many voices you have in your hallucinations? Do they have names that they told you, or have you named them yourself?