IMC, we added a sub-attribute to charisma, Appearance. Based on Charisma it is +/0/- 1d6 off of charisma open-ended. Roll a 6 on add and you get another, roll a 1 on a minus you subtract another d6. First you roll a d3 to see if you do anything. 1 - Subtract, 2 - nothing, 3 - add.
That simple. Allows the players and me to describe characters in a way without everyone being in the extremes. Also allows the ability to reference one character to another of same race to see which is better looking, not necessary better personality.
So far it has worked fine; I use this to add modifiers to charisma based skill rolls when needed. Dealing with opposite sex, etc.
OH.. And when Charisma is increased, normally Appearance is increased by a like amount, normally. Also since I use a modifier critical hit system, scarring can and does happen. Depending on that, it can affect appearance. Got one character, an Elven Bladesinger (Sorcerer-Fighter) with a nice clawed scar (3 lines) down the face from a Half-Green Dragon-Orge claw when he was much lower level. Taught him about looking around corners blind, never has figured out to use mirrors or scrying, instead just rushes on in. hehehe
He has used it to bolster his appearance somewhat, although he has other issues to overcome.
Not useless but not totally useful either.
RD