Looks are physical. Personality is not physical. So, looks have nothing to do with personality. But, you can appear in a bad way, like going nude in public. THEN looks are part of it.
Tone of voice can be part of it. Also, being respectful, and humility.
Sense of humor makes a person more attractive, but it's not necessarily part of a good personality, because some people make humor out of things that should not be made fun of, like rape. If the humor is correct, like late night comedy talk shows, that's fine, and that's when it makes a person more attractive. It's only part of a good personality if it's done to make people feel better, or something like that.