We do character meals without kids ALL the time (mainly because we're all 20 somethings without kids) Having done fur, face, a mix, and most of the options around property, and all have been awesome and fun interacting experiences. The characters might spend a little bit less time with you, and we have once had Piglet stop and our table, wave at us, and walk away before we had a CHANCE to stand up. But, if there's a character you miss that you really want to see, grab the character attendant & they'll make sure it happens.
We've always had a fun time and gotten our pictures done, book signed, and chat with them. My favorites are:
-1900 PF, breakfast & dinner, great food, and dinner has the Step Family which is the GREATEST
-Ohana breakfast, fun interaction, and great food
-Crystal Palace, pretty much only breakfast, it used to be a hands down fave, but it's slowly sliding
-I've heard RAVE reviews about Dinner at Hollywood & Vine with the fab 5
-Tusker House lunch is good!
-Garden Grill is hilarious fun, and great food, though the service is a bit slow
-Akershus is my pick for princess meal, it's a little cheaper than CRT, and it seems like we've always had better interactions there than the castle.