Can my character be a different age/gender/etc in the real world than the city?

The short answer is no. The more in depth answer is: only in specific, specialized cases. Most of the time, you'll be required to have them appear the same, at least in general terms (ie:the same pb). In rare cases, there can be differences, such as if a person is developmentally disabled in the real world, they may appear as a child in the city. If you want to apply for a character who is different in the city than in the real world, please detail and explain on your application how they are different, and why.