Our favorite character breakfast is Chef Mickey's at the Contemporary.
I especially like this one, if you're not doing other character meals, because it's the only character meal where you can find all 5 of the Fab 5 characters - Mickey, Minnie, Donald, Goofy, & Pluto.
Additionally, the setting feels very "Disney-ish to me - it's in the Contemporary & the monorail runs through. And there's "fun" stuff like napkin twirling too.
The dinner buffet doesn't get very good reviews, but we've always enjoyed the breakfast buffet! Plus, they have Mickey waffles!
And, if you're going into the MK after breakfast, the CR is just a short walk away from the MK.