I don't think it is being outgoing that is the factor for people being more attractive than they are physically - or vice versa. I believe it is entirely about their personality.

Someone with a genuinely true and pleasant personality is always more attractive than one who's beauty is solely physical. That is someone witty and able to maintain a conversation. Positivity is huge in this respect. Of course, that individual is often a people person.

Similarly, negativity will be a detractor. As is lack of empathy and fakeness.