In the fantasy RP, my characters have fairly distinctive voices. I cannot speak for the characters not under my control, but of the ones I control:
Adykon has a somewhat deep voice, and sounds like a soldier in his 30s. Not sure. I would say Harrison Ford, but the voice is deeper. Not like Steve Downes either (voice of Master Chief.)
Rhiga sounds like a chipper young woman who is always getting into and out of scrapes; she is occasionally snide, occasionally cowardly, sometimes cocky, and often charming. Maybe Cristina Ricci?
Vaeri, Rhiga's mother, sounds much like her daughter, if she were older, more subdued, and with a softer, more maternal voice. Not sure. Maybe Maggie Smith?
Vespion, the party's cleric sounds like a gentle, rather quiet type who is always looking out for others. Don't know. NOT Ian Mckellen.
Selturma sounds a bit like a young version of a little of Phoebe from "Friends." That would be like a young Lisa Kudrow.
Arcantas sounds like the villain Ad Avis from Quest For Glory IV... who was voiced in that game by none other than Jeff Bennett! Here's a link with the voice:
http://www.youtube.com/watch?v=DkRMgLlr2Uw . Listen at about 2:40.
I will add more character voices in time, as I think of them.