Just not being fat generally helps. I don't believe in fat shaming, and in most cases I don't think being fat is a sign of bad character, but I've had the experience of being fat (225 lbs at my heaviest) and dropping all that weight (today I'm 158 lbs at 11% BF). The difference in how the public treats you is night and day. People are friendlier and generally assume that you are more competent, sometimes overly so. If you want to be liked, be lean. Sorry to say it.

Facial bone structure is probably the most difficult thing to fix apart from height.