For breakfast it has always been Goofy, Minnie, Pluto, Chip & Dale.
We haven't done dinner for a long long time but in the 2x we did it, we saw Goofy, Minnie, and then 3 out of the following 4 characters : Mulan, Jasmine, Snow White, Pluto.
I'm not sure if the princesses still come to dinner since it has been some time & I have heard that over the last couple of years the quantity & quality if character interaction has decreased. I haven't ever noticed poor character interaction at bfast which is one of our favorites, so it seems that it might be dinner that has fewer characters now.
Also, one tip, request for the circular room so there's lots more light to take pictures with characters. A lot of the other tables are situated in dim lighting making it hard to get nice photos. But the circular room has a floor to ceiling windows that let in a lot of natural light for great photos.