Toward the beginning of the book we find the Disney artists just developing, and taking the in house art school that Walt set up, the reputation of which would live infamously. A manual used for the training was put together by Ted Sears and Freddie Moore, and contained this description of Mickey Mouse that I found absolutely delightful.
From Ted Sears:
"Mickey is not a clown...he is neither silly nor dumb.
"His comedy depends entirely upon the situation he is placed in
"his age varies with the situation...sometimes his character is that of a young boy, and at other times, as in the adventure type of picture, he appears quite grown up....
"Mickey is most amusing when in a serious predicament trying to accomplish some purpose under difficulties, or against time....When Mickey is working under difficulties, the laughs occur at the climax of each small incident or action. They depend largely upon Mickey's expression, position, attitude, state of mind, etc., and the graphic way that these things are shown....
"Mickey is seldom funny in a chase picture, as his character and expressions are usually lost."
Freddie Moore continues in the description of Mickey's personality:
" Mickey seems to be the average young boy of no particular age; living in a small town, clean living, fun loving, bashful around girls, polite, and clever as he must be for the particular story. In some pictures, he has a touch of Fred Astaire, in others, of Charlie Chaplin, and some, of Douglas Fairbanks, but in all of these, there should be some of the young boy. "