My trip is not until December, but wanted to chime in on Minnie's breakfast. My favorite character meal at both WDW and DL. And I second an earlier post recommending a LATE time. I used to get 10:45 or 10:30. As the resturant empties, the characters come over repeatedly and they stay longer. They play games with each other (we saw a limbo contest). It was up to 10 different characters. (Now with Covid rules, who knows?)
We would also be at park at 8-8:30 and ride some attractions first, that later get long lines.