You're showing your age DMOE .. there hasn't been a comeliness stat since first edition DnD!!!*suddenly realises that by pointing this out he also reveals that he is old enough to remember 1st edition rules ... runs away*
I've never played first edition DnD.....In fact Nibor told me about the comeliness stat on IRC so all I'm really showing is Nibor's age *grins and nods sagely*
I said yeah Nibor, that sounds wickety-wickety wack and then I grabbed my skateboard.
The most important thing to remember is to roleplay your attributes! If you have a low Charisma, play a low Charisma.
The guide that Patient Ox just posted actually seems to be a fair summation. At that level of CHA, you don't need to have ALL of those things - but one or two should be prominent.
repulsive, ugly, very suspicious, very rude, unapproachable, frightening