For years I've worked in sales engineering and have been the "go-to" guy for presentations and situations where others balked at public speaking. I have a deep, projecting voice that while some may consider me "loud", everyone can always hear me.
I do not do any impersonations so I would not be ideal for emulating anyone else per se, but my voice would be most ideal for cartoon villains, somber product endorsement, technical documentation, and dramatic deep delivery such as movie trailers, etc.
Difficult pronunciations are no problem. I am a former techinical writer for the software industry and ex instituional equity analyst, but I do have a sense of humor as well. :-)