There a character meals for breakfast, lunch, and dinner. Depending on the meal and location prices vary. Some of the more popular ones are at CRT, Crystal Palace, Chef Mickey's and Princess Storybook Breakfast.
My personal favorites are dinner at either Liberty Tree (in MK). This is all-you-can eat served family style. It is essentially Thanksgiving dinner. The food and interaction is great. We usually see Minnie, Chip, Dale, Pluto, and we've seen Meeko as well. We try to do this one every trip. I also, really enjoy dinner at Chef Mickeys. This is at the Contemporary. So no park admission is needed. They do breakfast here as well. It's a traditional buffet and a really awesome dessert bar. We've seen Mickey, Minnie, Donald, Chip, Dale, Goofy, and Stitch here. Of course characters are subject to change.
They have the Pooh characters at the Crystal Palace. Princesses are at CRT, Storybook Breakfast (soon they'll have a dinner too), and 1900 Park Fare at the GF. There's also meals at Cape May, AK, and the Poly.
Are you going to the Golf side or the Atlantic side for your ocean visit??