There are 3 that I've thought about - -
1. A Toy Story/Incredibles Lunch & Dinner at MGM -
I adore the idea of little individual jukeboxes/movie screens at each table! And, I'd also serve "fun" diner-type food - hamburgers, fries, deli sandwiches, etc. The atmosphere would be very diner-y too - booths, counter, chrome, vinyl, etc.
2. A "Happily Ever After" Dinner -
Characters would be the Disney Princesses w/ their Prince/Hero on a rotating basis - Cinderella & Prince Charming, Aurora & Prince Phillip, Snow White & the Prince, Beauty & the Beast, Ariel & Eric, etc. Both the Prince & the Princess would circulate among the tables together as a couple - maybe have 3 couples each evening (or at each setting), and, because the characters rotate, each evening is different.
Disney "love" songs would be playing softly in the background - either piped in music or someone playing the piano and/or harp. Candles on the table - very "romantic" atmosphere - yet, not so stuffy that families can't enjoy the meal as well. An overall "romantic-fun" feeling.
I'd put the "Happily Ever After" Dinner either in Cinderella Castle or somewhere at the Grand Floridian. In addition to typical dinner menu items, I'd also serve "dinner for two" meals.
If it weren't in the castle, then I'd have paintings from the different Disney movies showcasing the couples on the wall. The restaurant could even be sectioned off into separate areas with each area decorated like a specific Disney movie - for example, when you came for your 6:30 ADR, you & your family could be seated in the Beauty & the Beast Dining Room, and another family could be seated in Snow White's Forest or The Little Mermaid's Lagoon - where the tables would be shaped like boats. You would enter the restaurant in The Grand Hall where The Fairy Godmother would be waiting to greet you & then the different "areas" would branch off from The Grand Hall. And, while the restaurant would have separate, uniquely-designed areas, the character couples would visit each area.
3. A Surprise Character Breakfast, Lunch, & Dinner
All the characters would visit during breakfast, lunch, & dinner on a rotating basis. So, for breakfast, you might be visited by Rabbit from Winnie the Pooh, Baloo from The Jungle Book, Captain Hook from Peter Pan, Pluto, & Hercules. And, for lunch, you might be visited by Jessie from Toy Story, Mickey Mouse, Meeko from Pocahontas, Mary Poppins, and The Mad Hatter. And, at dinner, you might be visited by Donald Duck, Pinochhio, Peter Pan & Wendy, & Mulan. The characters at each meal would be different & they would be different from day-to-day, week-to-week as well - so it really is a surprise. But each meal would have some of the really "hard-to-find" characters.
I'd set the meal up in a new restaurant in the American Adventure area in Epcot - probably a buffet w/ typical American cuisine w/ some unique American dishes that have been popular throughout the years of our American history.