as for character breakfasts - Tusker House seems the toughest to get (well, after Chef mickey's!)
I notice this for each trip. We leave in 3 weeks and was just last night switching my breakfast ADRs around - Ohana, 1900 Park Fare, Hollywood & Vine, Cape May, even Akershus all still had availability pretty much for every day I looked for - yet Tusker House and Chef Mickey's, nope, nothing.