Here are some options:
Crystal Palace (B,L, D- MK) with Pooh & Friends
Liberty Tree Tavern (D- MK) with Minnie, Goofy, Pluto (we also had Chip & Dale)
Garden Grill (L, D- EPCOT) with Farmers Mickey, Pluto, Chip & Dale
Hollywood & Vine (B, L- Studios) with JoJo's Circus and Little Einsteins
Donald's Breakfast (B- AK) with Donald, Mickey, Goofy and Pluto
Cape May (B- Beach Club resort) with Goofy, Pluto, Chip and Dale
Chef Mickey's (B, D- Contemporary Resort) with Mickey, Chip, Dale, and Goofy
Ohanas Breakfast (B- Polynesian) with Lilo, Stitch, Pluto, and Goofy
Mickey's Backyard BBQ (D- Ft. Wilderness) with guess who??
As you can see, a lot of the same characters appear at different places. I would go with Liberty Tree Tavern, Hollywood & Vine (if they like those characters, the food is okay) and Chef Mickey's. Ohanas is great if they like Lilo and Stich.
I know you want all character meals, but a place like SciFi (Studios) would be fun for the kids (they get to eat in a car!) or Whispering Canyon Cafe (Wilderness Lodge). That is a hoot- just don't forget to ask for ketchup! Kids also like the Hoop De Doo at Ft. Wilderness- it's a dinner and corny/hilarious show).