(Israel’s voice is warm and mellow, but surprisingly youthful for a personification of his age. It has a slightly higher pitch by default, although not high enough for it to become annoying easily.
While he tends to talk rather quickly and may often sound rushed due to his nowadays busy, almost hectic lifestyle, there are times he takes his sweet time and speaks a lot slower – typically, when he’s explaining something to people, or he’s recalling the past and speaking about it with someone. Just sit him down when he’s not busy in the moment, that makes for a nice conversation.
Over all, his voice can be incredibly expressive and very nice to listen to, so conversing with him for a long time in a calm and quiet environment where he feels no need to rush things is bound to be an incredibly nice and calming experience. He tends to be quite soft-spoken unless a situation demands otherwise, and occasionally slips into a small lisp.
He has a voice claim too, which you can listen to here.)