Someone asked at one point:
"What does Sasha's voice sound like?" from the last comic page. That very tiny bit of dialogue "It is." apparently brought up that curiosity to hear those words spoken softly into one's ear. I would imagine Sasha's voice having a very Young Simba sound to it. Not particularly Jonathan Taylor Thomas, but very much like it. With a bit less scratchiness.

And Ruth? I could be wrong in casting this, but the first name that comes to mind would be Dante Basco. (the guy who voices Prince Zuko, from Avatar, The Last Airbender)