Perhaps think up some examples for certain parts of personality/history, so as to describe things better for those not familiar with the character.
Also, how the character tends to react to specific situations. That helps other writers know how best to approach them and stuff.
For those of us who don't really know the difference between US accents (aside from the obvious Southern ones or stereotypical New York), it might also be an idea to clarify what about North-Eastern accents are obvious. :)
Also, if he detests being seen as 'pretty', why hasn't he changed whatever it is about himself which apparently leads people to think that? Whether it be clothing, posture or something else.