The most popular meal at the Castle is the breakfast, which is a character meal, and I think it is $32.99 now - I think you should definately still try and get an ADR - you might be suprised! If not, how about lunch ($32.99) or even dinner (£39.99) - with dinner you get a photo set and a lithograph, and if you time it right, you might even see Wishes going on in MK!! Magical! I don't think dinner is a character one, but I do think Cinderella still greets in the lobby!! Give it a go!!
For Mickey, I would choose Chef Mickey's at the Contemporary Resort, Liberty Tree Tavern in MK -which is said to be the best character meal, food-wise, or if something more elaborate - Mickey's Backyard BBQ at Wilderness one evening - I think prices are $49.98 or something of the sort...
For Pooh Bear, definately do Crystal Palace in MK - this does breakfast, lunch and dinner....
I've never been to WDW, but looking forward to go!! We don't have any kids either but I'm going to be heading in there like the little ones with my autograph book!! Character meal wise, I've chosen the dinner at Cinderella's Royal Table, lunch at Crystal Palace, and breakfast at 1900 Park Fare (Alice, Mary Poppins, etc.. at the Grand Floridian)
Enjoy!!