Nemesis Destiny
Adventurer
I know what you mean. I've been told that I do pretty decent voices and accents and mimicry, but it's hard to stay doing it all night sometimes, so in order to not strain my voice and everyone's disbelief, I try to limit the really oddball ones to NPCs.You sound like me. My non-human characters probably end up seeming pretty human to the other players, though honestly that is usually the case with their characters as well. Only those who can do good "character voices" seem to be able to convey the otherness of the non-human.
That said, I try to have distinct manners of speaking for my characters when I am a player and supposedly, I rarely have to identify which character I'm voicing (we each have multiple characters all living in the same place) at any given time. My fellow players always know when I'm speaking as my lovestruck half-elf bard, jaded and bitchy human necromancer, or cold and aloof eladrin mage.