There aren't many choices.
1) Goofy's Kitchen at DLH does breakfast and dinner. I don't think they do lunch, but maybe on some days? Goofy, Minnie, Chip, Dale and Pluto. Although Mickey was there as a bonus on our last trip.
2) Storytellers at GCH is breakfast only. Chip, Dale, plus a couple other animal characters. Sometimes Koda or Kenai? Often Pluto. Not unique enough for my taste but many like the food.
3) Surfs Up at Paradise Pier. A little more out of the way, but seen by many as the best character interaction. Mickey, Minnie, Daisy, Stitch and someone else? I don't think it gets as much traffic, so that probably accounts for the extra interaction.
Those are all sort of a toss-up in my book. We do GK out of tradition. But my favorite character meal overall is Plaza Inn where you can get twice as many characters, but it's in the park.