I don't know if you notice, but not all of these character are on the same book ! Gladia, Elijah and Daneel are in "the Naked sun" together. Then, D.G Bailey and Gladia are in the robots and empire and then, Harri Seldon, Hobber Mallow and Salvor HArdin are in the first foundation book. And then, the mule is in Foundation and empire. So, it's not an all star cast and anyway, I've writen this thread to see if I see the character the same way as other fans, not to imagine a dream cast for a big movie ! I could have chose dead actors also because I just want to put a known face on the characters !