I feel like City Hall tonight with all these questions haha! :lol:
You will normally have about 8 characters throughout your meal.
These change every night but normally you should expect to meet Mickey, Minnie, Pluto, Chip and Dale, Tigger, Eeyore, Goofy. But as I said it is different every night - some nights have more characters and some nights less - on average there are more at the weekends.
The character interaction you get at this resturant is probably the best in the resort - its a much more relaxed atmosphere than Cafe Mickey, and I think more magical, but of course more expensive.