Am3 sound awful and kinda nerdy and kinda gay, on his talk about higher education he nasally say "Now that's rediculous, were not against education"
Stephan Letts got a very funny voice too, as his mouth opens unusually wide and his facial expression with his eyes opened wide has a strange resemblence to Marshall Applewhite.
Gerrit Losch just plain old boring and basically un animated, he probably put more people asleep when he talks than any other GB member alive or dead. He don't like sports and is probably getting old and cranky.
David Splane and his famous newlight talk about consolidation of power to the GB/F&DS "And brothers the Governing Body loves this idea as it truley dignifies the Great Crowd" should be easy to copy and build on.
Freddy Plaid Shirt Franz, has a fun voice to imatate and to has a great potential for lots of laugh as he waxes on about bible verse and delusional interpetations.
Karl Marble Mouth Klein, was hard to understand.
I'm sure some talented voice imatators could do a funny side splitting job on youtube that has the potential to be hilarious.