Of course personality is “cultivated”. Indeed, for those with reasonable sensibilities, it is cultivated to a far greater extent than one’s appearance.
There is beauty in motion because there is a beauty in functionality. The beauty (to compare humans to other animals, as is perfectly reasonable since both are animals) of a lion or a cheetah is not fully realized until you see it running. Fluidity and grace are beautiful – repose is simply boring. Wouldn’t you rather see a cheetah running down a gazelle than sitting in its cage in a zoo?
The “beauty” of Beau Brummel was in the confluence of personality, mannerism, and appearance. He was, of course, a phony and a poser, but that was his style and he did it well. It was Brummel who said, “If people turn to look at you on the street, you are not well dressed.” He recognized that dressing well involved avoiding calling attention to your clothes.
Brummel did share your aversion to fat people. When snubbed by the Prince of Wales while riding through Hyde Park, Brummel turned to the Prince’s companions, who were also friends of Brummel’s, and asked, “Who is your fat friend?”
Brummel died of syphillis.