I have a deep rich speaking voice. For narration it is authoritative and powerful.
For character work my 20 plus years of professional theatre training has helped develop improv skills and a multitude of characters. I can do anything from Wolfman Jack to crusty sour dough prospector. I don't so much mimic as I create a fleshed out character that resembles others you have heard from Dudley Doo Right type to Chumley the Walrus and a myriad in between. As for dialects I can do the Crocodile Hunter, American Southern, various British.
For answering systems the professional tone of voice lends more credibility to company.
My experience in video games has helped me develop many animal and other gutteral sounds.