The site I am developing has 2 type of profiles: the main account, and the alternative account associated with it. The alternative user gets blog posts, forum posts, under its own name. "He-man" and "Frodo" could be two examples.

The main accounts have signature, and image fields that never apply to them because the system always defaults to the alternative account for these things.

Since alternative accounts, and the main accounts both have different roles/permissions, how can I hide these fields using permissions?

I see that http://drupal.org/project/user_picture_field can be used to hide the picture field by setting permissions. How can I hide more than just the picture?