ohana's at the Poly has a great Character Breakfast. Last time we went the character interaction was outstanding. We are also planning the Breakfastosaurus at AK this Nov. We went in Feb 03 and had a great time. We had a 9:30 PS on an EE day... it was wonderful.. not rushed, fresh food, great service. Another you may want to try is Cyrstal Palace at MK. This is a great character meal no matter what time of day (of course Tigger is my fav character.. and Pooh .. and Piglet .. and.. well you get the picture).
No matter what Character breakfast you go to, it should be fun- really, it's all in how you approach it- if you want it to be fun,, it will be.
For dinner I hear Ohana's is also great-haven't been myself. It's not a character dinner. You could try the dinner Show at the Poly if it's in your budget- Spirit of Aloha is the name I think. I have only been to the old show at the Poly so I can't make any recommendations about it.
Have a great time, no matter what you choose. You have come to the right place for advice.