That looks like a great list. And I think you got most of them covered here.
My first thought for the jungle was Amumu because he is really easy to pick up and have an impact with. But jungle is also a complex role that isn't the most newb friendly anyway.
For support I'm inclined to say Soraka, but with a caveat. Her playstyle isn't the most exciting and isn't for everyone so while she is newb friendly in that she isn't very complex to play it likely won't be the best experience if you are trying to get a friend into the game. Obviously though if this is a playstyle they enjoy than Soraka might be good for them to check out.