When you are mysteriously interesting and people around you are incapable of decrypting you.
When you don't care about others opinion but believe in yourself.
When you are confident yet not arrogant.
When you speak less and listen more. Do not be an attention seeker it's hideous.
When you are intelligent people are bound to listen cause wisdom speaks.
Also being ridiculously beautiful or handsome gives you an instant attention because beauty speaks. Again don't be disappointed beauty is in the eyes of beholder and you never know who wants to know you :).
I am sure I would be interested to know such person