We go in August & have booked 10 day tickets but haven't got them yet.
I've already booked a PS for our breakfast, we're going to 1900 Park Fayre which is a character breakfast at the Grand Floridian hotel.
As Dis babe says the majority of the free breakfasts available aren't character breakfasts. I'd book if I was you.
The only character breakfast available in a park is Donalds Breakfasaurus in Animal Kingdom. We did this a couple of years ago & loved it. Lots of character interaction & great food.