Maya Grill at Coronado Springs...lovely decor, good food & great service. No characters but there is a really talented strolling guiter player.
Kona Cafe at the Polynesian...not fancy at all (cafe overlooks the lobby) but food is good, great desserts. No characters, no "entertainment" other than watching people walking by.
Grand Floridian Cafe at the Grand Floridian -- looks somewhat fancy, but the food is pretty much steakhouse-normal, with good desserts. No characters or entertainment.
The Wave at The Contemporary is a cool looking restaurant...food sounds "new age" with things like "sustainable greens" on the menu, but it's still just fairly normal tasting steaks, chicken, fish. No characters or entertainment.
If you want a buffet (without characters) Cape May Cafe at the Beach Club is no characters at dinner.
Captain's Grill at the Yacht Club...steak house food, not fancy. No characters, no entertainment.
If you're on the dining plan, all of these places are one Table Service credit per person. If you're paying cash, expect to spend about $25-50 per person, depending on what your like to eat, and whether you're getting appetizers & dessert.